[ prɒs'θi:sɪs , 'prɒsθɪˌsɪs ]
■ noun ( plural prostheses -si:z )
1》 an artificial body participle
2》 the addition of a letter or syllable at the beginning of a word, as in Spanish escuela derived from Latin scola .
Derivatives
prosthetic -'θɛtɪk adjective
prosthetically adverb
Origin
C16: via late L. from Gk ~ , from prostithenai 'add'.