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The Collaborative International Dictionary
Miniating

Miniate \Min"i*ate\, v. t. [imp. & p. p. Miniated; p. pr. & vb. n. Miniating.] [L. miniatus, p. p. of miniare. See Minium.] To paint or tinge with red lead or vermilion; also, to decorate with letters, or the like, painted red, as the page of a manuscript.
--T. Wharton.

Wiktionary
miniating

vb. (present participle of miniate English)