| Noun | 1. | order Laminariales - in some classifications coextensive with family Laminariaceae: marine brown algae of cold or polar seas protoctist order - the order of protoctists class Phaeophyceae, Phaeophyceae - brown algae; mostly marine and littoral eukaryotic algae family Laminariaceae, Laminariaceae - large family of marine brown algae including many economically important large kelps chiefly of northern waters |