Entry 2 senses · 2 variants Webster, 1913 Pinnatiped · Pin·nat·i·ped · IPA a. n. 01 a. Having the toes bordered by membranes; fin-footed, as certain birds. 1. Having the toes bordered by membranes; fin-footed, as certain birds.(Zool.) 02 n. Any bird which has the toes bordered by membranes. 1. Any bird which has the toes bordered by membranes.(Zool.)