| p | Greek lower case letter pi; the ratio of circumference to diameter, 3.1415926536 |
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| y | Greek letter psi; wave function |
| S | Greek capital letter sigma; syphilis; summation of series |
| s | Greek lower case letter sigma; conductivity; cross section; millisecond; molecular type or bond; pop... |
| t | Greek lower case letter tau; life [of radioisotope]; relaxation time; shear stress; spectral transmi... |
| sea crayfish | <zoology> Any crustacean of the genus Palinurus and allied genera, as the European spiny lobster (P. Vulgaris), which is much used as an article of food. See Lobster. Source: Websters Dictionary (01 Mar 1998) |
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| sea crow | <zoology> The chough. The cormorant. The blackheaded pewit, and other gulls. The skua. The razorbill. The coot. Source: Websters Dictionary (01 Mar 1998) |
| sea cucumber | <zoology> Any large holothurian, especially one of those belonging to the genus Pentacta, or Cucumaria, as the common American and European species. (P. Frondosa). Source: Websters Dictionary (01 Mar 1998) |
| sea cucumbers | A class of echinodermata characterised by long, slender bodies. (12 Dec 1998) |
| sea dace | <zoology> The European sea perch. Source: Websters Dictionary (01 Mar 1998) |
| sea daffodil | <botany> A European amarylidaceous plant (Pancratium maritimum). Source: Websters Dictionary (01 Mar 1998) |
| sea devil | <zoology> Any very large ray, especially any species of the genus Manta or Cepholoptera, some of which become more than twenty feet across and weigh several tons. See also Ox ray, under Ox. Any large cephalopod, as a large Octopus, or a giant squid (Architeuthis). See Devilfish. The angler. Source: Websters Dictionary (01 Mar 1998) |
| sea dog | 1. <zoology> The dogfish. The common seal. 2. An old sailor; a salt. Source: Websters Dictionary (01 Mar 1998) |
| sea dotterel | <zoology> The turnstone. Source: Websters Dictionary (01 Mar 1998) |
| sea dove | <zoology> The little auk, or rotche. Source: Websters Dictionary (01 Mar 1998) |
| sea dragon | <zoology> A dragonet, or sculpin. The pegasus. Source: Websters Dictionary (01 Mar 1998) |
| sea drake | <zoology> The pewit gull. Source: Websters Dictionary (01 Mar 1998) |
| sea duck | <zoology> Any one of numerous species of ducks which frequent the seacoasts and feed mainly on fishes and mollusks. The scoters, eiders, old squaw, and ruddy duck are examples. They may be distinguished by the lobate hind toe. Source: Websters Dictionary (01 Mar 1998) |
| sea eagle | 1. <zoology> Any one of several species of fish-eating eagles of the genus Haliaeetus and allied genera, as the North Pacific sea eagle. (H. Pelagicus), which has white shoulders, head, rump, and tail; the European white-tailed eagle (H. Albicilla); and the Indian white-tailed sea eagle, or fishing eagle (Polioaetus ichthyaetus). The bald eagle and the osprey are also sometimes classed as sea eagles. 2. <zoology> The eagle ray. See Ray. Source: Websters Dictionary (01 Mar 1998) |
| sea-ear | <zoology> Any species of ear-shaped shells of the genus Haliotis. See Abalone. Source: Websters Dictionary (01 Mar 1998) |