Entry 1 sense Webster, 1913 Hydrogenate /hīd'-rəj-ən-ātˌ/ · Hy·dro·gen·ate · IPA /haɪˈdɹɑd͡ʒəneɪt/ 01 v. t. To hydrogenize. imp. & p. p. Hydrogenated; p. pr. & vb. n. Hydrogenating 1. To hydrogenize.(Chem.)