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| phylum of radially symmetrical coelomate marine invertabrates |
| pertaining to creatures without a backbone |
| sigmoid flexure | |
| —n | |
| zoology an S-shaped curve, as in the necks of certain birds | |
sigmoid flexure n.
The S-shaped section of the colon between the pelvic brim and the third sacral segment, continuous with the rectum. Also called sigmoid colon.