chicken-mite

from The Century Dictionary.

• noun A minute, almost microscopic mite, Cytoleichus (formerly Cytodites) nudus, of the family Cytoleichidæ, which infests the air-passages and air-cells, and other portions of the domestic fowl. It is called the internal chicken-mite.
• noun A similar mite of the same family, Lamniosioptes cysticola, which occurs on the skin, but commonly penetrates also the subcutaneous connective tissues, where it gives rise to a calcareous cyst. It infests chickens, geese, and pheasants, and is called the cystic fowl-mite.
• noun The itch-mite of fowls, Sarcoptes (Cnemidocoptes) mutans and gallinæ, serious enemies of domestic fowls.
• noun Same as chicken-tick, 1.