Downward movement of an upper tooth due to the loss of its lower antagonist(s). ... See: supereruption. ... Origin: odonto-+ G. Ptosis, a falling ... (05 Mar 2000) ... 
Type: Term Pronunciation: ō′don-top-tō′sis, -tō-tō′sis Definitions: 1. Downward movement of an upper tooth due to the loss of its lower antagonist(s).