Japanese edit

For pronunciation and definitions of ぼおん – see the following entry.
母音ぼいん
[noun] (obsolete, phonology) one of the five morae of the あ行 (agyō, a-row), that consists solely of a vowel
[noun] (phonetics, phonology) a vowel
(This term, ぼおん, is the hiragana spelling of the above term.)