A web-footed bird. Now frequently archaic or historical.
The plural palmipedes may in some instances represent the Latin plural form..
adjective
Web-footed. Also (occasionally) of a foot: webbed.
Origin
Early 17th century; earliest use found in John Guillim (1550–1621), herald. From classical Latin palmiped-, palmipēs web-footed from palmi- + pēs foot.