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The Collaborative International Dictionary
Infuscate

Infuscate \In*fus"cate\, v. t. [L. infuscatus, p. p. of infuscare; pref. in- in + fuscare to make dark, fr. fuscus dark.] To darken; to make black; to obscure.

Wiktionary
infuscate

vb. To darken; to make black or obscure.

WordNet
infuscate

v. darken with a brownish tinge, as of insect wings