prothesis āļāļ·āļāļāļ°āđāļĢ prothesis āļāļ·āļāļāļ°āđāļĢ Linguistics The addition of a phoneme or syllable at the beginning of a word, as in Spanish espina, "thorn,â from Latin spina.Eastern Orthodox Church The preparation of the bread and wine for the Eucharist.Eastern Orthodox Church The table used for this preparation.