noun
nasal sound change; hatsuonbin
Linguistics term for the historical sound change where a verb stem ending in 'i' or 'u' generates the moraic nasal 'n' (ん), as in 読みて → 読んで. Often contrasted with 促音便 (geminate sound change).
See also: 促音便
「読んで」の「ん」は撥音便の例です。
The 'n' in 'yonde' is an example of hatsuonbin.
From 撥音 (hatsuon, 'moraic nasal') + 便 (bin, 'euphonic change'). The term describes a specific euphonic change in classical Japanese verb conjugation.