What are the words 'Rhythm' and 'Melody" in Latin?

Question

Ive looked everywhere but i cant find an actual translation. Are these words even IN Latin?

Answer 1

Rhythym = Numerus or Modus. Rhythmus does appear, but its use was very limited.
Melody = Melos

Answer 2

Looking up the etymology of the word: rhythm, I found this:
c.1557, from L. rhythmus "movement in time," from Gk. rhythmos "measured flow or movement, rhythm," related to rhein "to flow," from PIE base *sreu- "to flow" (see rheum). In M.L., rithmus was used for accentual, as opposed to quantitative, verse, and accentual verse was usually rhymed. Rhythm method of birth control attested from 1940. Rhythm and blues, U.S. music style, is from 1949.

melody:
c.1290, from O.Fr. melodie, from L.L. melodia, from Gk. meloidia "singing, chanting, a tune for lyric poetry," from melos "song, part of song," originally "limb" + oide "song, ode." Melodic is from 1823.

These words appear to be greek derived rather than latin and post date the latin era.