Definition of rhotacism in US English:

rhotacism

(also rhotacismus)

noun

  • 1Linguistics. The changing of another sound, especially the phoneme/s/, into the phoneme/r/, and thus often also the changing of the spelling.

  • 2Unusual pronunciation or pronounced production of the phoneme/r/ as a phonological characteristic or speech defect; specifically the use of the burr or uvular r.

Origin

Mid 19th century. From German Rhotacismus from Byzantine Greek ῥωτακίζειν + German -ismus.

Pronunciation

rhotacism

/ˈrəʊtəsɪz(ə)m/