Button hook, a hook for catching a button and drawing it through a buttonhole, as in buttoning boots and gloves. -- Button shell (Zoöl.), a small, univalve marine shell of the genus Rotella. -- Button snakeroot. (Bot.) (a) The American composite genus Liatris, having rounded buttonlike heads of flowers. (b) An American umbelliferous plant with rigid, narrow leaves, and flowers in dense heads. -- Button tree (Bot.), a genus of trees (Conocarpus), furnishing durable timber, mostly natives of the West Indies. -- To hold by the button, to detain in conversation to weariness; to bore; to buttonhole.

He was a tall, fat, long-bodied man, buttoned up to the throat in a tight green coat.
Dickens.