Plural form referring to multiple aphids or members of the aphid group; can be used as both a nominal and adjectival plural.
From 'aphid' plus '-ian' (member or follower of) with plural -s. Created in scientific nomenclature to classify organisms in the Aphididae family.
Calling individual aphids 'aphidians' is like calling humans 'hominids'—technically correct but so formal that you'd only hear it in dusty entomology textbooks!
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