LATIN DICTIONARYLexicon Latīnum
noun

prosthĕsis

Meaning

  1. a grammatical figure consisting in the prefixing of a letter

prosthĕsis, is, f., = πρόσθεσις, and prŏthĕsis, is, f., = πρόθεσις,
I. a grammatical figure consisting in the prefixing of a letter or syllable to a word, prosthesis; as gnatus for natus, tetuli for tuli, Charis. 4; Diom. 2.

Quick answers

What does prosthĕsis mean in Latin?
prosthĕsis, a noun, means “a grammatical figure consisting in the prefixing of a letter”.