As adjectives the difference between webbed and keld
is that webbed is (of some feet) with the digits connected by a thin membrane while keld is (obsolete) having a kell or covering; webbed.
webbed
English
Adjective
(-)
(of some feet) With the digits connected by a thin membrane.
Resembling a web.
Connected to the World Wide Web.
keld
English
Adjective
(
-)
(obsolete) Having a kell or covering; webbed.
- (Drayton)
(
Webster 1913)