Definition of: synura

(sin·yr′ə) noun plural ·u·rae (-yr′ē)
Any of a genus (Synura) of flagellate protozoans, uniting in subspherical clusters and discharging oil globules. They are common in swamp waters and render drinking water unpalatable by giving it a cucumberlike flavor. [<NL <Gk. synouros, synoros bordering on <syn- together + oros a boundary]