Definition of acher:
(n) :
(usually humorous) Something that aches.
(n) :
Obsolete form of acre. [An English unit of land area (symbol: a. or ac.) originally denoting a day's ploughing for a yoke of oxen, now standardized as 4,840 square yards or 4,046.86 square metres.]
(n) :
Obsolete form of usher. [A person, in a church, cinema etc., who escorts people to their seats.]