1. [adj]  covered with or resembling small bubbles as from being agitated by beating or heating; "the bubbling candy mixture"; "a cup of foaming cocoa"; "frothy milkshakes"; "frothy waves"; "spumy surf"
2. [adj]  producing or covered with lathery sweat or saliva from exhaustion or disease; "the rabid animal's frothing mouth"
3. [adj]  emitting or filled with bubbles as from carbonation or fermentation; "bubbling champagne"; "foamy (or frothy) beer"

FOAMING is a 7 letter word that starts with F.