ap|te|ri|um

ap|te|ri|um «ap TIHR ee uhm», noun, plural -ri|a «-ree uh».

one of the featherless spaces on the skin of a bird intervening between the feathered tracts.

╂[< New Latin apterium < Greek ápteros featherless, wingless; see etym. under apterous (Cf. ↑apterous)]