A cupcake whose top section is cut out and replaced on a layer of butter cream, etc. in the approximate shape of a butterfly's wings.

Alternative form of buttercream

Aglais io, a red butterfly with distinctive large eyespots, of the family Nymphalidae.

(sewing) A hook used to pull thread through the holes of a button. / A hook for pulling the buttons of gloves and shoes through the buttonholes.

(American football) To perform the buttonhook play.

plural of butter bomb

(informal) A wine in which diacetyl is deliberately promoted in order to impart a buttery flavour.

(construction) indenting two or more thicknesses of metal that are pressed against each other to prevent slippage between the metal.

plural of button man

(slang) A contract killer; a professional assassin.