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sigmoid |
3 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Semilunar \Sem`i*lu"nar\, a. Shaped like a half moon. {Semilunar bone} (Anat.), a bone of the carpus; the lunar. See {Lunar}, n. {Semilunar}, or {Sigmoid}, {valves} (Anat.), the valves at the beginning of the aorta and of the pulmonary artery which prevent the blood from flowing back into the ventricle. From Webster's Revised Unabridged Dictionary (1913) [web1913]: Sigmoid \Sig"moid\, Sigmoidal \Sig*moid"al\, a. [Gr. ???; ??? sigma + ??? form likeness: cf F. sigmo["i]de.] Curved in two directions, like the letter S, or the Greek [sigmat]. {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}. From WordNet r 1.6 [wn]: sigmoid adj 1: curved in two directions (like the letter S) 2: of or relating to the sigmoid flexure in the large intestine [syn: {sigmoidal}]
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