dil·do \ˈdil(ˌ)dō\noun (-s) Etymology: origin unknown 1. a.: phallus b.usuallydil·doe\“\: an object serving as a penis substitute for vaginal insertion 2.obsolete — used as refrain syllables in a song 3.obsolete: a weak or effeminate man 4.: a cylindrical curl usually of a wig or peruke 5.[probably so called from its shape]: a West Indian spiny cactus (Lemaireocereus hystrix) with columnar joints and pink flowers