Prŏs'the-sis, n.

n. [Lat., Gr. πρόσθεσις, from προστιθέναι, to put to, to add, from πρός, to, and τιθέναι, to put, place; Fr. prosthèse.]

1. (Surg.) The addition of an artificial part to supply a defect of the body; prothesis. Quincy.
2. (Gram.) A figure consisting in prefixing one or more letters to the beginning of a word; as, beloved.