noun euglena A green, single-celled, freshwater organism with a flagellum, sometimes forming a green scum on stagnant water. 1
noun euglena (biology) Any of several protists, of the genus Euglena, that contain chloroplasts and a single flagellum. 0
noun euglena any freshwater unicellular organism of the genus Euglena, moving by means of flagella and typically having holophytic nutrition. It has been variously regarded as an alga or a protozoan but is now usually classified as a protoctist (phylum Euglenophyta) 0
noun euglena any of a genus (Euglena) of green protists with a single flagellum, a reddish eyespot, and a flexible body shape 0
