Hypertext Webster Gateway: "Sigmoid"
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) 1.7 (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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