Definition of rhotacization in English:

rhotacization

(also rhotacisation)

noun

Phonetics
  • [mass noun] Pronunciation of a vowel to reflect a following r in the orthography, as for example in American English farm, bird.

Origin

1970s: from rhotacize (from Greek rhōtakizein) + -ation.

Pronunciation:

rhotacization

/ˌrəʊtəsʌɪˈzeɪʃə(ə)n/