My ribs are like a xylophone, and the knobs of my spine stick up like ponderous cairns in the landscape of my back.
He required others to open doors for him because he so abhorred touching the knobs or other metal objects.
late 14c., knobe, probably from a Scandinavian or German source (cf. Middle Low German knobbe "knob," Middle Dutch cnoppe, Dutch knop, Old Frisian knopp, knapp, Old High German knopf, German Knopf "button," Old Norse knyfill "short horn"). Meaning "knoll, isolated round hill" is first recorded 1640s, especially in U.S.