from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Having the shape of the letter S.
  • adj. Of or relating to the sigmoid colon.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Curved in two directions, like the letter "S", or the Greek ς (sigma).
  • adj. Semi-circular, like the lunar sigma (similar to English C).
  • adj. Relating to the sigmoid flexure of the large intestine.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Curved in two directions, like the letter S, or the Greek ς.

from The Century Dictionary and Cyclopedia

  • Shaped like the Greek capital letter sigma in either of its forms. (See sigma, 1.)
  • Specifically— Of the colon, at the end of the descending colon, terminating ill the rectum.
  • Of the spinal column of man and a few of the highest apes, highly characteristic of the erect attitude. It does not exist in the infant.
  • Of the cervical vertebral of birds and some reptiles, as cryptodirous turtles, when the head is drawn in straight upon the shoulders. It disappears when the head is thrust forward and the neck thus straightened out. It is very strongly marked in long-necked buds, as herons.
  • Synonyms See semilunar.
  • n. A sigmoid curve.
  • n. The region of the sigmoid flexure of the colon.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. of or relating to the sigmoid flexure in the large intestine
  • adj. curved in two directions (like the letter S)


from The American Heritage® Dictionary of the English Language, 4th Edition

Greek sīgmoeidēs : sīgma, sigma; see sigma + -oeidēs, -oid.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek σιγμοειδής (sigmoeidēs), from σίγμα (sigma) or σῖγμα (sigma, "sigma") + εἶδος (eidos, "form, likeness"). Compare with French sigmoïde.


  • Morren [233] describes a form intermediate between the ordinary slipper-shaped corolla and the perfect peloria just described, and which he calls sigmoid peloria.

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  • In its course it rests upon the squama of the occipital, the mastoid angle of the parietal, the mastoid part of the temporal, and, just before its termination, the jugular process of the occipital; the portion which occupies the groove on the mastoid part of the temporal is sometimes termed the sigmoid sinus.

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  • Travels downward on the left side, to the next curve in the colon, called the sigmoid colon.

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  • It ascends through the right lumbar and hypochondriac regions to the under surface of the liver; it here takes a bend, the right colic flexure, to the left and passes transversely across the abdomen on the confines of the epigastric and umbilical regions, to the left hypochondriac region; it then bends again, the left colic flexure, and descends through the left lumbar and iliac regions to the pelvis, where it forms a bend called the sigmoid flexure; from this it is continued along the posterior wall of the pelvis to the anus.

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  • The one problem I had was that, due to certain not uncommon digestive complaints and a routine office exam, a gastroenterologist had discovered a benign polyp in my sigmoid colon.

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  • The curbs are sharp and perpendicular, not like the American smoothly molded sigmoid-cross-section curves.

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  • Interestingly it normally occurs in the sigmoid colon in Europeans but mum has it where Asians and Africians get it - were it is mistaken for appendicitis!

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  • The dose-response curve normally takes the form of a sigmoid curve (see Figure 3).

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  • They contained numerous sigmoid earthworm chaetae.

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  • They are fundamental to the operation of the computer you're staring at right now: the behavior of every one of the billions of transisitors in it is described by a sigmoid curve, albeit one that has such sharp transitions and such a steep slope that it becomes, effectively, an on/off switch.

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