pleophony
/plɪˈɒfəni/ /plɪˈɒf(ə)ni/Linguistics
noun
In East Slavonic languages: a type of vowel duplication whereby the sequences -oro-, -olo-, and -ere- have developed from earlier Slavonic -ra-, -la-, -le-, and -re- occurring between consonants; the process of development of this phenomenon.
Origin
1940s; earliest use found in Archivum Linguisticum. From pleo- + -phony, after apophony, homophony, etc., and Russian polnoglasie.