† cryptoneurousadj.ZoologyObsoleterare (of an invertebrate) having no discernible nervous system.Apparently only attested in dictionaries or glossaries.
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1882 New Sydenham Soc. LexiconCryptoneurous, applied by Rudolphi to a series of animals the nervous system of which is mingled and confounded with the mass which constitutes them, as the zoophytes.