Last Updated：2025/11/20
In historical phonology, prothesis refers to the addition of a sound at the beginning of a word without changing its morphological structure, as in Spanish esfera from Latin sphaera (without prothesis the word would have become *sfera).
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In historical phonology, prothesis refers to the addition of a sound at the beginning of a word without changing its morphological structure, as in Spanish esfera from Latin sphaera (without prothesis the word would have become *sfera).
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歴史音声学では、語頭挿入は語の形態的構造を変えることなく語頭に音素を付け加える現象を指し、例えばスペイン語のesferaがラテン語のsphaeraから発達したように（この語頭挿入がなければ語は*sferaになっていただろう）。
