Oxford Dictionary English linseed oil nounnoun BrE BrE//ˈlɪnsiːd ɔɪl// ; NAmE NAmE//ˈlɪnsiːd ɔɪl// (also flaxseed oil) [uncountable] Add to my wordlistjump to other resultsan oil made from flax seeds, used in paint or to protect wood, etc.See linseed oil in the Oxford Advanced American DictionaryCheck pronunciation: linseed oil oxfordlearnersdictionaries.com