Yeasty/ˈjiːsti/ Definition 1 of 3Pro Tip 1/2Sensory Description Often describes appealing food scents, evoking the warm, comforting feelings associated with baking. The bakery's yeasty scent made my mouth water. Pro Tip 2/2Not Always Positive Sometimes implies unwanted or excessive fermentation, implying a mildewy or stale quality. The towels developed a yeasty smell from being left damp.