趾し骨こつしこつMeanings1nounphalanx of the foot; toe boneanatomyAnatomical term for the bones of the toes. Compare 指骨 (phalanx of the hand).See also: 指骨足あしの趾し骨こつは片かた足あしに14本ほんあります。There are 14 phalanges in each foot.