A large American butterfly (Papilio troilus). It is black, with yellow marginal spots on the front wings, and blue on the rear.

plural of butterfly valve

(computing) A kind of computer keyboard consisting of two separate halves, intended to facilitate typing with two hands.

plural of butterfly keyboard

plural of butterfly child

A child who has epidermolysis bullosa.

plural of butterfly door

(automotive) A car door similar to scissor door, but while scissor doors move straight up via hinge points at the bottom of the A-pillar, butterfly doors move up and out via hinges along the A-pillar.

(US) A hamburger made with butter, whether it is mixed with the meat or applied to the bun before toasting.

plural of butterburger