The story
From New Latin, from Ancient Greek meaning "indiscernible"; see a- and compare criterion.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: The lowest groups of animals, in which no nervous system has been observed. Today it roughly corresponds to the protozoans Full definition →
From New Latin, from Ancient Greek meaning "indiscernible"; see a- and compare criterion.
Etymology from Wiktionary, CC BY-SA 4.0.