tu·ber·os·i·ty of dis·tal pha·lanx (of hand and foot)
[TA] a roughened raised surface of horseshoe shape on the palmar surface of the distal end of the terminal or ungual phalanx of each finger and toe, which serves to support the pulp of the digit. Synonym(s): tuberositas phalangis distalis (manus et pedis) [TA], tuberositas unguicularis, ungual tuberosity