Entry 1 sense Webster, 1913 Interdigital /ĭnˌ-tẽrd-ĭj'-ət-əl/ · In·ter·dig·i·tal · IPA /ˌɪntərdˈɪdʒətəl/ 01 a. Between the fingers or toes; as, interdigital space. 1. Between the fingers or toes; as, interdigital space.(Anat.)