axillar

Any of the feathers connecting the undersurface of the wing and the body, and concealed by the closed wing.

Japanese Meaning

閉じた翼に隠れている、翼の下面と胴体を連結する羽毛

The ornithologist carefully examined the axillar to determine whether the bird had completed its molt.

その鳥の換羽が完了しているかどうかを確認するために、鳥類学者は慎重に腋羽を調べた。

Sense（1）

Any of the feathers connecting the undersurface of the wing and the body, and concealed by the closed wing.

axillars

（ plural ）