| sea urchins | Somewhat flattened, globular echinoderms of the class echinoidea, having thin, brittle shells of calcareous plates. (12 Dec 1998) |
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| 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 wolf | <zoology> The wolf fish. The European sea perch. The sea elephant. A sea lion. 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) |