1. (n.) One of the Diatomaceae, a family of minute unicellular Algae having a siliceous covering of great delicacy, each individual multiplying by spontaneous division. By some authors diatoms are called Bacillariae, but this word is not in general use.

2. (n.) A particle or atom endowed with the vital principle.

Ectocarpales Iceland moss Irish moss Phaeophyceae autophyte bean bracken brown algae climber conferva confervoid creeper diatom dulse fern fruits and vegetables fucoid fucus fungi fungus grapevine green algae gulfweed herb heterophyte ivy kelp legume lentil liana lichen liverwort mold molds moss mushroom parasite parasitic plant pea perthophyte phytoplankton plankton planktonic algae plant families pond scum puffball pulse red algae reindeer moss rockweed rust saprophyte sargasso sargassum scum sea lentil sea moss sea wrack seaweed smut succulent thallogens toadstool vetch vine wort wrack