adjective, knob·bi·er, knob·bi·est. full of or covered with knobs: the knobby trunk of a tree. shaped like a knob. adjective -bier or -biesthaving or covered with small knobs; knobbly adj.1540s, from knob + -y (2). Alternative form knobbly attested from 1859. Related: Knobbiness.
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