Entry 1 sense Webster, 1913 Erinaceous · Er·i·na·ceous · IPA /ˌɛ.ɹɪˈneɪ.ʃəs/ 01 a. Of the Hedgehog family; like, or characteristic of, a hedgehog. 1. Of the Hedgehog family; like, or characteristic of, a hedgehog.(Zoöl.)