Superlative form of foamy; the most foamy, most frothy, or having the most bubbles compared to all other things.
From 'foam' + '-y' (adjective suffix) + '-est' (superlative suffix), creating the highest degree comparison following standard English morphology.
The superlative '-est' ending is disappearing from English—we increasingly say 'most foamy' instead of 'foamiest,' which suggests our language is simplifying by replacing old inflections with analytic forms.
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