Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- adjective Having the shape of the letter S.
- adjective Of or relating to the sigmoid colon.
from The Century Dictionary.
- 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 . - noun A sigmoid curve.
- noun The region of the sigmoid flexure of the colon.
from the GNU version of the Collaborative International Dictionary of English.
- adjective Curved in two directions, like the letter S, or the Greek ς.
- adjective (Anat.) the last curve of the colon before it terminates in the rectum. See
Illust. underDigestive . - adjective (Anat.) See Semilunar valves, under
Semilunar .
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective geometry Curved in two directions, like the letter "
S ", or the Greekς (sigma). - adjective geometry, archaic
Semi-circular , like the lunar sigma (similar to EnglishC ). - adjective anatomy Relating to the sigmoid flexure of the
large intestine .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adjective of or relating to the sigmoid flexure in the large intestine
- adjective curved in two directions (like the letter S)
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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Morren [233] describes a form intermediate between the ordinary slipper-shaped corolla and the perfect peloria just described, and which he calls sigmoid peloria.
Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants Maxwell T. Masters
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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.
The Piezo Array 2007
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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.
Archive 2008-09-01 AYDIN 2008
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They contained numerous sigmoid earthworm chaetae.
Is it a slug? Is it a ghost? It's Selenochlamys ysbryda AYDIN 2008
bbben commented on the word sigmoid
Some corrections are needed for (spell-check defeating) typos for the definitions listed for 'sigmoid' in the section attributed to The Century Dictionary:
1. The sigmoid colon could feasibly end 'in' or 'at' the rectum but not 'ill' the rectum.
2. 'Of the cervical vertebral' should be change to 'vertebrae'.
3. Herons are not small protuberances developing on stems of plants; 'buds'. Herons belong to a class of warm blooded, egg laying, winged, feathered, beaked vertebrates; 'birds'.
Additionally, in the second definition for 'sigmoid' attributed to Wiktionary, the term for the Greek symbol for Sigma in the form of a semicircle (found beginning in earliest manuscripts of the New Testament) is 'lunate sigma', though a few non-authoritative examples using 'lunar sigma' come up in searches.
April 24, 2020