Meaning of apteryla | Babel Free
Definitions
Any of the regions of a bird's skin, between the pterylae, which are free of contour feathers, and where filoplumes and down may grow.
CEFR level
B2
Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.
This word is part of the CEFR B2 vocabulary — upper intermediate level.