Definition from Wiktionary, the free dictionary
mainyard (plural mainyards)
- (sailing) The yard of the mainmast, from which the mainsail is hung
1914, E.H. Aitken, Concerning Animals and Other Matters:
- A long line of red and white flags extends from the top of the mainyard to the helm and streamers flutter from the mastheads.
the yard of the mainmast, from which the mainsail is hung