Entry 2 senses · 2 variants Webster, 1913 Splayfoot · Splay·foot · IPA n. a. 01 n. A foot that is abnormally flattened and spread out; flat foot. pl. Splayfeet 1. A foot that is abnormally flattened and spread out; flat foot. 02 a. Having a splayfoot or splayfeet. 1. Having a splayfoot or splayfeet.