upperwing

noun

upperwing

noun

Etymology From upper + wing.

1

The upper part of a wing of a bird or butterfly

The original article (which see) mentions that the primary shafts on the upperwings lacked any whitish coloration.2015, Bob Flood, Ashley Fisher, Martin Elliott, Pterodroma Petrels: North Atlantic Seabirds:

Related terms: wingtip, underwing

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.