adjective,covered with or consisting of ice. Icy definition, made of, full of, or covered with ice: icy roads. 4 days ago · icy definition: 1. 1a : covered with, abounding in, or consisting of ice. "Icy" comes from fresh, cold, or "ice age", "iced out", which refers to the action of wearing diamond wrist bands and necklaces which are transparent and have.