In human anatomy, the lower colon (the lower portion of the large bowel). "Sigmoid" is short for "sigmoid colon." The word "sigmoid" came from the Greek letter "sigma" which is shaped like a C. It also means curved in two directions like the letter S. A sigmoid curve is an S-shaped curve. The sigmoid flexure of the colon is the point where it makes the turn from transverse to descending colon. Sigmoidoscopy is a procedure in which a viewing tube (a sigmoidoscope) is inserted up into the sigmoid colon. The term "rectosigmoid" refers to both the rectum and the sigmoid colon above it.
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Resembling in outline the letter S or one of the forms of the Greek sigma. [G. sigma, the letter S, + eidos, resemblance]

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sig·moid 'sig-.mȯid adj
1 a) curved like the letter C
b) curved in two directions like the letter S
2) of, relating to, or being the sigmoid colon of the intestine <\sigmoid lesions>

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sig·moid (sigґmoid) [Gr. sigmoeidēs, from the letter sigma + eidos form] 1. shaped like the letter S or the letter C. 2. colon sigmoideum.

Medical dictionary. 2011.

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  • sigmoid — SIGMOÍD, Ă, sigmoizi, de, adj. Care este de forma literei sigma. ♢ Valvulă sigmoidă = fiecare dintre cutele membranoase situate la originea arterei aorte şi a arterei pulmonare. – Din fr. sigmoïde. Trimis de RACAI, 18.04.2008. Sursa: DEX 98 … …   Dicționar Român

  • Sigmoid — Sig moid, Sigmoidal Sig*moid al, a. [Gr. ???; ??? sigma + e i^dos form, likeness: cf. F. sigmo[ i]de.] Curved in two directions, like the letter S, or the Greek [sigmat]. [1913 Webster] {Sigmoid flexure} (Anat.), the last curve of the colon… …   The Collaborative International Dictionary of English

  • Sigmoid — means resembling the lower case Greek letter sigma (ς). Specific uses include:* Sigmoid function, a mathematical function * Sigmoid colon, part of the large intestine or colon …   Wikipedia

  • sigmoid — [sig′moid΄] adj. [Gr sigmoeidēs: see SIGMA & OID] 1. a) having a double curve like the letter S b) curved like the letter C (uncial form of sigma) 2. of the sigmoid flexure of the colon: Also sigmoidal sigmoidally …   English World dictionary

  • sigmoid — index circuitous Burton s Legal Thesaurus. William C. Burton. 2006 …   Law dictionary

  • sigmoid — (adj.) shaped like a C (1660s) or shaped like an S (1786), from SIGMA (Cf. sigma) + OID (Cf. oid). Especially of the flexure of the colon (1891) …   Etymology dictionary

  • sigmoid — /ˈsɪgmɔɪd/ (say sigmoyd) adjective 1. curved in one direction like the letter C. 2. curved in two directions like the letter S. 3. relating to the sigmoid flexure: the sigmoid artery (which supplies this flexure). Also, sigmoidal /sɪgˈmɔɪdl/ (say …  

  • sigmoid — also sigmoidal adjective Etymology: Greek sigmoeidēs, from sigma; from a common form of sigma shaped like the Roman letter C Date: 1670 1. a. curved like the letter C b. curved in two directions like the letter S 2. of, relating to, or being the… …   New Collegiate Dictionary

  • Sigmoid — Das Wort Sigmoid bezeichnet in der Mathematik eine Funktion mit S förmigem Verlauf des Graphen, siehe Sigmoidfunktion in der Medizin die Verbindung zwischen menschlichem Dick und Mastdarm, siehe Colon sigmoideum Diese Seite ist eine Begri …   Deutsch Wikipedia

  • sigmoid — sigmoidally, adv. /sig moyd/, adj. 1. shaped like the letter C. 2. shaped like the letter S. 3. of, pertaining to, or situated near the sigmoid flexure of the large intestine. Also, sigmoidal. [1660 70; < Gk sigmoeidés shaped like a sigma. See… …   Universalium

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