| perch | <zoology> 1. Any fresh water fish of the genus Perca and of several other allied genera of the family Percidae, as the common American or yellow perch (Perca flavescens, or Americana), and the European perch (P. Fluviatilis). 2. Any one of numerous species of spiny-finned fishes belonging to the Percidae, Serranidae, and related families, and resembling, more or less, the true perches. Black perch. The black bass. The flasher. The sea bass. Blue perch, the cunner. Gray perch, the fresh water drum. Red perch, the rosefish. Red-bellied perch, the long-eared pondfish. Perch pest, a small crustacean, parasitic in the mouth of the perch. Silver perch, the yellowtail. Stone, or Striped, perch, the pope. White perch, the Roccus, or Morone, Americanus, a small silvery serranoid market fish of the Atlantic coast. Origin: OE. Perche, F. Perche, L. Perca, fr. Gr.; cf. Dark-coloured, Skr. Pni spotted, speckled, and E. Freckle. Source: Websters Dictionary (01 Mar 1998) |
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| perched wetland | <ecology> Wetlands away from stream or river influence with water made available by general drainage. (09 Oct 1997) |
| perchlorate | <chemistry> A salt of perchloric acid. Source: Websters Dictionary (01 Mar 1998) |
| perchloric | <chemistry> Pertaining to, or designating, the highest oxygen acid (HClO4), of chlorine. Synonym: hyperchloric. Origin: Pref. Per- + chloric. Source: Websters Dictionary (01 Mar 1998) |
| perchloric acid | <chemical> An oxidizing agent that is used in analytical chemistry for separation of potassium from sodium. Chemical name: Perchloric acid (12 Dec 1998) |
| perchloride | <chemistry> A chloride having a higher proportion of chlorine than any other chloride of the same substance or series. Source: Websters Dictionary (01 Mar 1998) |
| perchromic | <chemistry> Pertaining to, or designating, a certain one of the highly oxidized compounds of chromium, which has a deep blue colour, and is produced by the action of hydrogen peroxide. Origin: Pref. Per- + chromic. Source: Websters Dictionary (01 Mar 1998) |
| sea perch | <zoology> The European bass (Roccus, or Labrax, lupus); called also sea dace. The cunner. The sea bass. The name is applied also to other species of fishes. Source: Websters Dictionary (01 Mar 1998) |
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