Meaning of rhotacization in English:

rhotacization

Pronunciation /ˌrəʊtəsʌɪˈzeɪʃn/

noun

(also British rhotacisation)
mass noun
  • 1Linguistics
    Change of an original s or z to r, as in was and were.

    1. 1.1Phonetics Pronunciation of a vowel to reflect a following r in the orthography, e.g., in farm, bird.

Origin

1940s from rhotacize (from Greek rhōtakizein) + -ation.