plaice (n.) Look up plaice at Dictionary.com
type of European edible flatfish, late 13c., from Old French plaise (12c., Modern French plie), from Late Latin platessa "plaice, flatfish," perhaps related to or from Greek platys "broad, flat," from PIE *plat- "to spread" (source also of Sanskrit prathati "spreads out;" Hittite palhi "broad;" Lithuanian platus "broad;" German Fladen "flat cake;" Old Norse flatr "flat;" Old English flet "floor, dwelling;" Old Irish lethan "broad"); extended variant form of root *pele- (2) "flat; to spread" (see plane (n.1)).