Full of clots or having a tendency to form clots; lumpy or curdled in appearance.
From 'clot' plus the suffix '-y' (Old English '-ig'), which transforms nouns into adjectives meaning 'having the quality of' or 'resembling' the noun.
Old paint, old blood, or improperly stored cream can all become clotty—and it's always gross, but it's also a visible sign of chemistry happening right before your eyes!
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