(n.) The study of sounds uttered by the human voice in speech, including the various distinctions, modifications, and combinations of tones; phonetics\. Also, a treatise on sounds.

ablaut acoustic phonetics articulatory phonetics betacism bowwow theory comparative linguistics derivation descriptive grammar descriptive linguistics dialectology dingdong theory etymology generative grammar glossematics glossology glottochronology glottology gradation grammar grammatical analysis grammatical theory grammaticality graphemics historical linguistics language study lexicology lexicostatistics linguistic geography linguistic science linguistics mathematical linguistics morphology morphophonemics mutation orthoepy paleography parsing philology phonetics phrase-structure grammar psycholinguistics rhotacism rules of language school grammar semantics sociolinguistics sound shift stratificational grammar structural grammar structuralism syntactics tagmemic analysis traditional grammar transformational grammar transformational linguistics umlaut