There are two words that refer to exploring caves. The older is speleology, with its derived speleological and speleologist, (from Latin spelaeum, which variously meant a cave, cavern, den, or grotto) (it derives from Greek spelaion, a cave). Spelunking is from spelunca, which the Romans took over from the Greek spelynx. Spelunk for a cave, borrowed from the Latin via Old French, briefly existed in English.