Prothesis (linguistics)
（重定向自Prothetic）
In linguistics, prothesis (from post-classical Latin based on Ancient Greek πρόθεσις próthesis 'placing before'), or less commonly prosthesis (from Ancient Greek πρόσθεσις prósthesis 'addition') is the addition of a sound or syllable at the beginning of a word without changing the word's meaning or the rest of its structure. A vowel or consonant added by prosthesis is called prothetic or prosthetic.