The upper lip or terminal segment of a flower's labellum (lip), particularly in orchids, expressed in Latinate botanical terminology.
From Greek epi- (upon) + cheilos (lip) + Latin -ium (neuter noun suffix). This Latinized form was created by combining Greek roots with Latin grammatical endings, standard practice in scientific nomenclature.
Scientists use Latin and Greek roots because these languages don't change—an epichilium described in 1850 is identically named today, which helps researchers across centuries understand each other's flower descriptions perfectly.
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