"bowl-shaped hollow at the head of a valley," 1853, from Welsh cwm "coomb" (see coomb). Mostly they are formed by glaciers.
cutworm
cuz
Cuzco
cv
cw-
cwm
cwt.
-cy
cyan-
cyan
cyanide
)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}