<B>sightseeing, </B>noun, adjective.<DL COMPACT><DD><I>noun </I> the action of going around to see objects or places of interest. <BR> <I>Ex. a weekend of sightseeing.</I> <DD><I>adj. </I> that goes around to see or show objects or places of interest. <BR> <I>Ex. a sightseeing tour, a sightseeing bus.</I> </DL>
<A NAME="sightseer">
<B>sightseer, </B>noun.<DL COMPACT><DD> a person who goes around to see objects or places of interest. </DL>
<A NAME="sightworthy">
<B>sightworthy, </B>adjective, <B>-thier,</B> <B>-thiest.</B><DL COMPACT><DD> worthy of being seen, or of being visited as a sight. </DL>
<A NAME="sigil">
<B>sigil, </B>noun.<DL COMPACT><DD><B> 1. </B>an occult mark or sign, as in astrology or magic. <BR> <I>Ex. Sign and sigil, word of power, From the earth raised keep and tower (Scott).</I> <DD><B> 2. </B>a seal or signet. </DL>
<A NAME="sigill">
<B>sigill.,</B><DL COMPACT><DD> seal (Latin, <I>sigillum</I>). </DL>
<A NAME="sigillary">
<B>sigillary, </B>adjective.<DL COMPACT><DD> having to do with seals or signets. </DL>
<A NAME="sigillate">
<B>sigillate, </B>transitive verb, <B>-lated,</B> <B>-lating.</B><DL COMPACT><DD><B> 1. </B>to mark with or as with impressions of a seal. <DD><B> 2. </B>to close by or as by sealing. </DL>
<A NAME="sigillatedearth">
<B>sigillated earth,</B><DL COMPACT><DD> Lemnian earth, so called because it is made into cakes stamped with a seal. </DL>
<A NAME="sigillation">
<B>sigillation, </B>noun.<DL COMPACT><DD><B> 1. </B>the act of marking or the state of being marked with or as with a seal. <DD><B> 2. </B>a mark or marking so made. </DL>
<A NAME="sigillographer">
<B>sigillographer, </B>noun.<DL COMPACT><DD> a person who is skilled in sigillography. </DL>
<A NAME="sigillography">
<B>sigillography, </B>noun.<DL COMPACT><DD> the science or study of seals or signets. </DL>
<A NAME="sigma">
<B>sigma, </B>noun.<DL COMPACT><DD><B> 1. </B>the 18th letter of the Greek alphabet, corresponding to the English <I>S, s.</I> <DD><B> 2. </B>something shaped like the letter S. <DD><B> 3. </B>something shaped like the letter C (from the shape of the Greek letter in its uncial form). <DD><B> 4. </B><B>=sigma factor.</B> <DD><B> 5. </B><B>=sigma particle.</B> </DL>
<A NAME="sigmafactor">
<B>sigma factor,</B><DL COMPACT><DD> a protein that stimulates the synthesis of chains of ribonucleic acid. <BR> <I>Ex. The function of the sigma factor is to give the core enzyme its specificity to transcribing from a fixed point on a strand of DNA and producing RNA of defined length (Science Journal).</I> </DL>
<A NAME="sigmaparticle">
<B>sigma particle,</B><DL COMPACT><DD> an unstable elementary particle having a mass approximately 2400 times that of the electron. <BR> <I>Ex. The heavy sigma particle and the antiproton are produced by allowing beams from the CERN 28-GeV proton accelerator to strike metal targets (New Scientist).</I> </DL>
<A NAME="sigmate">
<B>sigmate, </B>adjective, verb, <B>-mated,</B> <B>-mating.</B><DL COMPACT><DD><I>adj. </I> <B>1. </B>S-shaped; having the form of a sigma. <DD><B> 2. </B>shaped like a C. <DD><I>v.t. </I> to add a sigma or <I>s</I> to; change by the addition of an <I>s</I> at the end, as <I>upward</I> into <I>upwards.</I> </DL>
<A NAME="sigmation">
<B>sigmation, </B>noun.<DL COMPACT><DD> the adding of a sigma or <I>s</I> at the end of a word or a syllable. </DL>
<A NAME="sigmatism">
<B>sigmatism, </B>noun.<DL COMPACT><DD><B> 1. </B>the use or presence of sigma or <I>s;</I> repetition or recurrence of <I>s</I> or of the <I>s-</I>sound. <DD><B> 2. </B>difficult or defective pronunciation of the sound <I>s.</I> </DL>
<A NAME="sigmic">
<B>sigmic, </B>adjective.<DL COMPACT><DD> of or containing sigma particles. <BR> <I>Ex. Kaonic and sigmic atoms tend to go together, since experiments aimed at making kaonic atoms make sigmic ones too (Science News).</I> </DL>
<A NAME="sigmoid">
<B>sigmoid, </B>adjective.<DL COMPACT><DD><B> 1. </B>shaped like the letter S. <BR> <I>Ex. P. F. Verhulst showed in 1838 that the growth of human population followed an S-shaped or sigmoid curve (F. S. Bodenheimer).</I> <DD><B> 2. </B>(Anatomy.) having to do with the sigmoid flexure of the colon. <DD><B> 3. </B>shaped like the letter C. </DL>
<A NAME="sigmoidal">
<B>sigmoidal, </B>adjective. =sigmoid.</DL>
<A NAME="sigmoidflexure">
<B>sigmoid flexure,</B><DL COMPACT><DD><B> 1. </B>(Anatomy.) the S-shaped bend of the colon just above the rectum. <DD><B> 2. </B>(Zoology.) an S-shaped curve. </DL>
<A NAME="sigmoidoscope">
<B>sigmoidoscope, </B>noun.<DL COMPACT><DD> a tube about 10 inches long which is inserted through the anus for the purpose of examining the colon. <BR> <I>Ex. ... the use of the sigmoidoscope in routine physical examination to spot cancer of the colon (Frank P. Matthews).</I> </DL>
<A NAME="sign">
<B>sign, </B>noun, verb.<DL COMPACT><DD><I>noun </I> <B>1. </B>an inscribed board, plate, or space serving for advertisement, guidance, or information. <BR> <I>Ex. See the sign over the door. The sign reads, "Keep off the grass." The names of streets are on signs at the corners.</I> <DD><B> 2a. </B>an indication. <BR> <I>Ex. There are no signs of life about the house. Careful scrutiny revealed signs that someone had broken in. The ruin is a sign of past grandeur.</I> <DD><B> b. </B>an indication of a disease. <BR> <I>Ex. Fever is often a sign of infection.</I> <DD><B> 3. </B>an indication of a coming event. <BR> <I>Ex. Dawn is the first sign of a new day. The coming of robins is a sign of spring. The star in the east was a sign of Christ's coming.</I> <DD><B> 4. </B>a trace. <BR> <I>Ex. The hunter found signs of deer.</I> <DD><B> 5a. </B>any mark or thing used to mean, represent, or point out something. <BR> <I>Ex. to use an equal sign. Three balls are the sign of a pawnbroker. We lunched at the sign of the Red Lion.</I> <DD><B> b. </B>(Mathematics.) a mark or symbol used especially to indicate an operation to be performed on a quantity or number or a relation of quantities or numbers. <BR> <I>Ex. The four signs of the arithmetic operations are addition (+), subtraction (-), multiplication (X), division (/). The sign (=) means "equals." The signs (+) and (-) in algebra and higher mathematics define positive and negative numbers.</I> <DD><B> c. </B>(Music.) a flat, sharp, or other symbol used in notation to give directions, indicate tonality, etc. <DD><B> 6. </B>a motion or gesture used to mean, represent, or point out something. <BR> <I>Ex. The priest made the sign of the cross. A nod is a sign of agreement. We talked to the deaf man by signs.</I> <DD><B> 7. </B>any one of the twelve divisions of the zodiac, each named for a constellation and each denoted by a special symbol. <DD><B> 8. </B>a miraculous occurrence. <DD><I>v.t. </I> <B>1. </B>to put one's name on. <BR> <I>Ex. Sign this letter. He signed the check.</I> <DD><B> 2. </B>to write. <BR> <I>Ex. Sign your initials here.</I> <DD><B> 3. </B>to designate (oneself) in a signature or signatures. <BR> <I>Ex. He signed himself "a constant reader."</I> <DD><B> 4. </B>to hire by a written agreement. <BR> <I>Ex. to sign a new ballplayer, to sign on a new crew.</I> <DD><B> 5. </B>to mark with a sign. <DD><B> 6. </B>to mark, protect, or consecrate with the sign of the cross. <DD><B> 7. </B>to give a signal to; communicate by gesture. <BR> <I>Ex. to sign someone to enter, to sign assent.</I> <DD><B> 8. </B>to indicate; signify; betoken. <DD><I>v.i. </I> <B>1. </B>to write one's name to show authority, agreement, or obligation. We sign for telegrams or parcels. <BR> <I>Ex. Sign on the dotted line.</I> <DD><B> 2. </B>to accept employment. <BR> <I>Ex. They signed for three years.</I> <DD><B> 3. </B>to make a sign or signal. <BR><I>expr. <B>sign away,</B> </I>to give by signing one's name. <BR> <I>Ex. to sign away one's inheritance. "I promise," he said, with a sense of despair, as though he were signing away the whole future (Graham Greene).</I> <BR><I>expr. <B>sign in,</B> </I>to register one's arrival by signing; check in. <BR> <I>Ex. The convention delegates were asked to sign in at the door.</I> <BR><I>expr. <B>sign off,</B> <DD><B> a. </B>to stop broadcasting after announcing the end of a program. </I> <I>Ex. The show signs off at midnight.</I> <DD><B> b. </B>to quit, as a job or service. <BR> <I>Ex. I shipped out in a tanker, signed off six months later in Honolulu, and went to work in a junkyard (Peter Throckmorton).</I> <BR><I>expr. <B>sign on,</B> <DD><B> a. </B>to join or enlist by written agreement; sign up. </I> <I>Ex. He signed on as first mate.</I> <DD><B> b. </B>to begin broadcasting. <BR> <I>Ex. The station signs on with the playing of the National Anthem.</I> <BR><I>expr. <B>sign out,</B> </I>to register one's departure by signing. <BR> <I>Ex. She had to leave work early and was the first to sign out that day.</I> <BR><I>expr. <B>sign over,</B> </I>to hand over by signing one's name. <BR> <I>Ex. He has signed over one of his houses to his brother.</I> <BR><I>expr. <B>sign up,</B> </I>to enlist or join by written agreement. <BR> <I>Ex. The new boy in school has signed up as a member of our club.</I> </DL>
<A NAME="signable">
<B>signable, </B>adjective.<DL COMPACT><DD><B> 1. </B>that can be signed; requiring a signature. <DD><B> 2. </B>that can sign. </DL>