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After the genus Amorpha (herbs and shrubs).
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A sesquiterpene (1S,4aR,8aS)-4,7-dimethyl-1-(propan-2-yl)-1,2,4a,5,6,8a-hexahydronaphthalene Full definition →
After the genus Amorpha (herbs and shrubs).
Etymology from Wiktionary, CC BY-SA 4.0.