Sigmoid flexure(Anat.), the last curve of the colon before it terminates in the rectum. See Illust. under Digestive.Sigmoid valves. (Anat.) See Semilunar valves, under Semilunar.

(Sig*moid"al*ly), adv. In a sigmoidal manner.

(Sign) n. [F. signe, L. signum; cf. AS. segen, segn, a sign, standard, banner, also fr. L. signum. Cf. Ensign, Resign, Seal a stamp, Signal, Signet.] That by which anything is made known or represented; that which furnishes evidence; a mark; a token; an indication; a proof. Specifically: (a) A remarkable event, considered by the ancients as indicating the will of some deity; a prodigy; an omen. (b) An event considered by the Jews as indicating the divine will, or as manifesting an interposition of the divine power for some special end; a miracle; a wonder.

Through mighty signs and wonders, by the power of the Spirit of God.
Rom. xv. 19.

It shall come to pass, if they will not believe thee, neither hearken to the voice of the first sign, that they will believe the voice of the latter sign.
Ex. iv. 8.

(c) Something serving to indicate the existence, or preserve the memory, of a thing; a token; a memorial; a monument.

What time the fire devoured two hundred and fifty men, and they became a sign.
Num. xxvi. 10.

(||Sig`il*la"ri*a), n. [NL., fem sing. fr. L. sigillum a seal.] (Paleon.) A genus of fossil trees principally found in the coal formation; — so named from the seallike leaf scars in vertical rows on the surface.

(Sig`il*la"rid) n. (Paleon.) One of an extinct family of cryptagamous trees, including the genus Sigillaria and its allies.

(Sig"il*la`ted) a. [L. sigillatus adorned with little images.] Decorated by means of stamps; — said of pottery.

(Sig"il*la*tive) a. [L. sigillum a seal: cf. OF. sigillatif.] Fit to seal; belonging to a seal; composed of wax. [R.]

(||Si*gil"lum) n.; pl. Sigilla [L.] (Rom. & Old Eng. Law) A seal.

(||Sig"la) n. pl. [L.] The signs, abbreviations, letters, or characters standing for words, shorthand, etc., in ancient manuscripts, or on coins, medals, etc. W. Savage.

(||Sig"ma) n.; pl. Sigmas [L., from Gr. .] The Greek letter &SIGMA, &sigma, or &sigmat (English S, or s). It originally had the form of the English C.

(Sig"mo*dont) n. [Gr. sigma + a tooth.] (Zoöl.) Any one of a tribe (Sigmodontes) of rodents which includes all the indigenous rats and mice of America. So called from the form of the ridges of enamel on the crowns of the worn molars. Also used adjectively.

(Sig"moid Sig*moid"al) a. [Gr. sigma + form, likeness: cf. F. sigmoïde.] Curved in two directions, like the letter S, or the Greek &sigmat.

  By PanEris using Melati.

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