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Webster 1913 Edition

Sigmoidal

{

Sig′moid

,

Sig-moid′al

, }
Adj.
[Gr. [GREEK][GREEK][GREEK]; [GREEK][GREEK][GREEK] sigma +
εἶδοσ
form, likeness: cf. F.
sigmoïde
.]
Curved in two directions, like the letter S, or the Greek ς.
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
.

Webster 1828 Edition

Sigmoidal

SIGMOID'AL

,
Adj.
[Gr. digma and eidoV.]Curved like the Greek sigma. The sigmoid flexure, in anatomy, is the last curve of the colon, before it terminates in the rectum.

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