Having a dark red or blackish-red color.
From Latin atro- (dark) + rubent- (reddening, from rubere meaning 'to be red'). This rare descriptive term combines Latin roots to express a specific shade of dark red or crimson.
Atrorubent is an example of how old Latin-based English used stacked descriptive prefixes to paint precise color pictures—it's much more evocative than just saying 'dark red,' suggesting something almost sinister or blood-like.
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