The word "apheter" may seem unusual and unfamiliar, but it can actually be an acceptable spelling of the word "apter", which means "having no wings". This word is pronounced as /ˈæptər/ according to the International Phonetic Alphabet (IPA) transcription. Its origin comes from the Greek word "apteros", which also meant "wingless". While "apheter" may not be the most commonly used spelling of this word, it is a valid option that can be used interchangeably with "apter".
Term applied by M. Foster to a catastate which decomposes inogen and thus initiates muscular movement.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.