Kalmar “pisiform” tana nufin ƙaramin ƙashi mai siffar fis wanda yake a wuyan hannu, a gindin hannu. Kalmar ta samo asali ne daga kalmar Latin "pisum," wanda ke nufin "fis," da kuma kari "-form," wanda ke nufin "siffa." Don haka, ana kiran ƙashin pisiform saboda ƙanƙanta, zagaye, siffar fis.
