chlo·ro·phy·ce·ae \ˌ ̷ ̷ ̷ ̷ at chloro-+ˈfīsēˌē, ˈfis-\noun plural Usage: capitalized Etymology: New Latin, from chlor- + -phyceae : a class of algae (division Chlorophyta) distinguished chiefly by having a clear green color, their chlorophyll being masked or altered little or not at all by other pigments • chlo·ro·phy·cean\| ̷ ̷ ̷ ̷|fīshən, -|fish-\adjective