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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.

Definition 2024

sigmoidal

sigmoidal

English

Adjective

sigmoidal ‎(not comparable)

  1. (statistics) Characterized by a sigmoid curve or function
    • 2009 January 7, Jeffrey R. Moffitt et al., “Intersubunit coordination in a homomeric ring ATPase”, in Nature, volume 457, number 7228, DOI:10.1038/nature07637:
      The requirement […] typically results in a sigmoidal dependence on [ATP] 38 —the hallmark of binding cooperativity.

Anagrams

Etymology

sigmoid +‎ -al

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