Word of the day

Speleology - the scientific study of caves, from Greek Spelaion for cave.  Spotted today in an interesting article about Caracalla's Baths in the Guardian.  You'll pardon my ignorance, my Oxford book of Ologies & Isms leaps from spectr(o) to -sperm.  Before today, if challenged to come up with a word for the study of caves, I'd probably have gone for Troglology.