osculate
Concise Oxford English Dictionary © 2008 Oxford University Press:
osculate /ˈɒskjʊleɪt/
▶verb
- 1 Mathematics (of curves or surfaces) touch so as to have a common tangent at the point of contact.
- 2 humorous kiss.
– derivatives
osculant adjective,
osculation noun,
osculatory adjective.
osculant adjective,
osculation noun,
osculatory adjective.
– origin C17: from L. osculat-, osculari ‘kiss’.
'osculate' also found in these Oxford entries:

