n epithet expressing want of colour. The word is Greek, being compounded of a privative, and χρῶν colour.

ACHROMATIC Telescopes. See Optics, no. 20.

ACHYR, a strong town and castle of the Ucrain, subject to the Russians since 1667. It stands on the river Uorsklo near the frontiers of Russia, 127 miles W. of Kiow, Long. 36° 0' Lat. 49° 32'.