plural of ACH

(biochemistry) Abbreviation of acetylcholinesterase.

Alternative form of bellyaching

plural of belly-aching

Alternative form of faceache

The guttural phoneme /x/ (the voiceless velar fricative) of the German language, the sound of the letters ch in German coming immediately after a, o and u (central and back vowels), also found in other languages.

Alternative spelling of stomachache

plural of stomach ache

(slang) A nuisance

plural of ach-laut