What is the meaning of Platy?

Resembling plates.

Semy of plates (roundels argent).

Composed of thin plate-like pieces of rock or mineral.

Any of two species (and hybrids) of tropical fish of the genus Xiphophorus (which also includes the swordtails).

platy (either of two species Xiphophorus maculatus and X. variatus, and their hybrids)

Source: wiktionary.org

See also