Noun
Either half of a square-rigged vessel's yard, from the center or mast to the end.
Source: Webster's dictionaryStubb and Flask kill a right whale whose head is fastened to a yardarm opposite the sperm whale's head. Source: Internet
He falls into the head, and the head falls off the yardarm into the sea. Source: Internet
He is now known for hanging the governor of Martinique from the yardarm of his ship. Source: Internet