A genus of extinct or fossil plants characterized by leaves resembling those of the aralia genus.
From 'aralia' (the plant genus) combined with Greek 'phyllon' (meaning 'leaf') and the Latin suffix '-um' (neuter gender ending). It's a descriptive botanical term naming plants by their leaf shape.
Paleobotanists name fossil plants by their leaves since that's what usually survives fossilization—'araliaephyllum' is essentially saying 'this ancient plant had aralia-looking leaves,' which helps them figure out what it was.
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