1530s, "a cornerstone," variant spelling of coin (n.); in early use also in other senses of that word, including "a wedge."
quiz
quizzical
quo warranto
quod
quodlibet
quoin
quoit
quoits
quondam
Quonset hut
quorate
)window.location='https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=byronic106@yahoo.com&lc=US&item_name=Donation+to +Help+Keep+Etymonline+Free+and+Open&no_note=0&cn=&curency_code=USD&bn=PP-DonationsBF:btn_donateCC_LG.gif:NonHosted'){kind=link}