upperwing

Noun

The upper part of a wing of a bird or butterfly

Japanese Meaning

鳥や蝶の翼の上部

The scientist carefully examined the butterfly's upperwing to identify its species.

科学者は蝶の種を特定するため、その翼の上面を注意深く調べた。

Sense（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.

upperwings

（ plural ）