| spiral tubule | The segment of urinary tubule coming next after the proximal convoluted tubule. (05 Mar 2000) |
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| spiral valve of cystic duct | A series of crescentic folds of mucous membrane in the upper part of the cystic duct, arranged in a somewhat spiral manner. Synonym: plica spiralis ductus cystici, Amussat's valve, Heister's valve, spiral valve of cystic duct, valvula spiralis. (05 Mar 2000) |
| spiral vein of modiolus | The vein running a spiral course in the modiolus of the cochlea; it is tributary to both the labyrinthine vein and the vein of the cochlear canaliculus. Synonym: vena spiralis modioli. (05 Mar 2000) |
| spiralling | Recycling of organic matter and nutrients between streambed and water column along a stream course. (09 Oct 1997) |
| spiralozooid | <zoology> One of the special defensive zooids of certain hydroids. They have the form of long, slender tentacles, and bear lasso cells. Origin: Spiral + zooid. So called because they often have a spiral form when contracted. Source: Websters Dictionary (01 Mar 1998) |