discursus (diskersus)

[LL., a conversation, discourse: see discourse, n.] Ratiocination; argumentation; discourse. discus (dis'kus), n.; pl. disci (-sī). [L. (NL., etc.), a discus, the disk of a dial, 2. In an at., phys., zoöl., and bot., a disk of any kind.-3. [ cap.] In zoöl.: (a) A genus of mollusks. (b) A genus of acalephs. Le on, 1837. (c) A genus of scombroid fishes. Campbell, 1879.-Discus blastodermic us. Same as blastodermic disk (which see, under blastodermic ). - Discus pro liger us, in an at., a ma of cells derived from the membrana granulosa of the Graafian vesicle, accumulated around the ovum in a kind of granular zone.