Comparative form of foamy; more full of foam, more frothy, or having more bubbles than something else.
From 'foam' + '-y' (adjective suffix) + '-er' (comparative suffix), following standard English patterns for creating comparative adjectives from root words.
English comparative adjectives follow predictable patterns—'foamier,' 'foamiest'—but we still have ancient irregular comparatives like 'good/better/best' that survive from Old English and remind us how the language has evolved.
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