None of them. It seems to be of a Proto-Indo European origin.
lung
O.E. lungen (pl.), from P.Gmc. *lungw- (cf. O.N. lunge, O.Fris. lungen, M.Du. longhe, Ger. lunge "lung"), lit. "the light organ," from PIE *lengwh- "not heavy, light, easy, agile, nimble" (cf. Rus. lëgkij, Pol. lekki "light;" Rus. lëgkoje, Pol. lekkie "lung," Gk. elaphros "light" in weight;
Online Etymology Dictionary, © 2010 Douglas Harper
is heptathalon a greek or latin word
The original word was the Latin monarcha, which evolved into the Greek word monárchēs. Therefore, it does have origins in both Latin and Greek.
Greek word- Plathelminthes. Latin word-cestus
The root word "dorm" is Latin. It comes from the Latin word "dormire," which means "to sleep."
latin
latin
Latin.
Latin
latin
"Fract" is a Latin root word, derived from the Latin verb "frangere" meaning "to break."
Greek
greek