margarine UK /ˌmɑː.d͡ʒəˈɹiːn/US /ˈmɑɹ.d͡ʒəˌɹin/noun 2verb 1forms 3 noun2 •A spread, manufactured from a blend of vegetable oils (some of which are hydrogenated), emulsifiers etc, mostly used as a substitute for butter. •(old-fashioned) The solid ingredient of human fat, olive oil, etc. verb1 •To spread or cover (something) with margarine.Putting the finishing touches on her party dinner, this attractive hostess does the last minute job of margarining her rolls to serve piping hot to her guests. — 1952 formsmargarined · margarining · margarines