Each of the featherless spaces on the skin of a bird intervening between the feathered tracts or pterylæ.
| 单词 | θ38828 |
| 释义 | the world > animals > birds > feather > [noun] > clump of or pteryla > space dividing or apterium (1) apterium1867 Each of the featherless spaces on the skin of a bird intervening between the feathered tracts or pterylæ. |
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