Abbreviation of autonomous oblast. / Abbreviation of autonomous okrug. / (US, Navy) Abbreviation of auxiliary oiler. / (chemistry) Initialism of atomic orbital. / Abbreviation of area of operations.

A small, short-term unsecured loan of money at an extremely high interest rate.

plural of Rehm

(mineralogy) An orthorhombic-dipyramidal yellow orange mineral containing magnesium, manganese, oxygen, and silicon.