The prepending of phonemes 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).
a type of preparatory ceremony, part of the Divine Liturgy of the Eastern Orthodox Church
From Late Latin prothesis, prosthesis, alteration (dropping the ‘s’) from Ancient Greek πρόσθεσις ("addition, augmentation"), (English prosthesis) from προστίθημι, from πρός + τίθημι, from Proto-Indo-European *próti, *préti + *dʰédʰeh₁-.
However, often confused for a descendant of the Ancient Greek word πρόθεσις (without the σ), which is instead the source of a different term – see alternative etymology, below.
From Ancient Greek πρόθεσις ("a preposing"), from προτίθημι, from πρό + τίθημι, from Proto-Indo-European *pro + *dʰédʰeh₁-.
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