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From Biology-Online Dictionary
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1. (Science: astronomy) The twelfth sign of the zodiac, marked <pisces/ in almanacs. A zodiacal constellation, including the first point of aries, which is the vernal equinoctial point; the fish.

2. (Science: zoology) The class of vertebrata that includes the fishes. The principal divisions are elasmobranchii, ganoidei, and teleostei.

Origin: L. Piscis a fish.