-āt, usu -ād.+V transitive verb
( -ed/-ing/-s )
Etymology: hydrogen + -ate
1. : to combine with hydrogen
hydrogenate a vegetable oil to a fat
2. : to treat with or expose to hydrogen
hydrogenate rosin
— compare harden vt 1a
• hy·dro·gen·a·tor -ād.ə(r) noun -s