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foliage (n.)

mid-15c., ffoylage, "representation of leaves or branches" (as an ornamental design). Compare Middle French feuillage, from Old French feuille "leaf, foliage" (from PIE root *bhel- (3) "to thrive, bloom"). The form has altered 17c. by influence of Latin folium or its derivatives in English.

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Definitions of foliage from WordNet

foliage (n.)
the main organ of photosynthesis and transpiration in higher plants;
Synonyms: leaf / leafage
foliage (n.)
(architecture) leaf-like architectural ornament;
Synonyms: foliation
From wordnet.princeton.edu