harelip
Concise Oxford English Dictionary © 2008 Oxford University Press:
harelip/ˈheəlɪp/
▶noun another term for cleft lip.
– derivatives
harelipped adjective.
harelipped adjective.
– origin C16: from a perceived resemblance to the mouth of a hare.
usage: The word harelip can cause offence and should be avoided; use cleft lip instead.
'harelip' also found in these Oxford entries:

