Pisces

Definition:

(n. pl.) The twelfth sign of the zodiac, marked / in almanacs.
(n. pl.) A zodiacal constellation, including the first point of Aries, which is the vernal equinoctial point; the Fish.
(n. pl.) The class of Vertebrata that includes the fishes. The principal divisions are Elasmobranchii, Ganoidei, and Teleostei.

Compare pisces with other words:

lamprey vs. pisces