Entry 2 senses · 2 variants Webster, 1913 Inhalant /ĭnˌ-hāl'-ənt/ · In·hal·ant · IPA /ˌɪnhˈeɪlənt/ a. n. 01 a. Inhaling; used for inhaling. 1. Inhaling; used for inhaling. 02 n. An apparatus also called an inhaler (which see); also, that which is to be inhaled, especially a medicine taken by inhalation. 1. An apparatus also called an inhaler (which see); also, that which is to be inhaled, especially a medicine taken by inhalation. Also: inhaler