| sea unicorn | <zoology> The narwhal. Source: Websters Dictionary (01 Mar 1998) |
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| sea urchin | <zoology> Any one of numerous species of echinoderms of the order Echinoidea. When living they are covered with movable spines which are often long and sharp. Source: Websters Dictionary (01 Mar 1998) |
| sea urchin granuloma | Granulomatous nodules, either foreign-body type or composed of epitheliod cells, from the retention of the spine of the sea urchin, occurring several months after the wounding of the skin. (05 Mar 2000) |
| sea urchins | Somewhat flattened, globular echinoderms of the class echinoidea, having thin, brittle shells of calcareous plates. (12 Dec 1998) |
| sea whip | <zoology> A gorgonian having a simple stem. Source: Websters Dictionary (01 Mar 1998) |
| sea widgeon | <zoology> The scaup duck. The pintail duck. Source: Websters Dictionary (01 Mar 1998) |
| sea willow | <zoology> A gorgonian coral with long flexible branches. Source: Websters Dictionary (01 Mar 1998) |
| sea wing | <zoology> A wing shell (Avicula). Source: Websters Dictionary (01 Mar 1998) |
| sea woodcock | <zoology> The bar-tailed godwit. Source: Websters Dictionary (01 Mar 1998) |
| sea wood louse | <zoology> A sea slater. Source: Websters Dictionary (01 Mar 1998) |
| sea wormwood | <botany> A European species of wormwood (Artemisia maritima) growing by the sea. Source: Websters Dictionary (01 Mar 1998) |
| sea wrack | <botany> See Wrack. Source: Websters Dictionary (01 Mar 1998) |