Plants belonging to the former taxonomic division Cryptogamia, which formed one of the two major divisions of plants and comprised the cryptogams. Also (in form Cryptogamia): this division.
Mid 18th century; earliest use found in John Hill (bap. 1714, d. 1775), physician and actor. From scientific Latin Cryptogamia (LinnaeusGenera Plantarum 320) from crypto- + ancient Greek γάμος marriage + scientific Latin -ia; compare Hellenistic Greek ἀγαμία.