oracle

Universal Words noun [C] 1 (in ancient Greece) a place where people could go to ask the gods for advice or information about the future; the priest or PRIESTESS through whom the gods were thought to give their message: They consulted the oracle at Delphi. 2 (in ancient Greece) the advice or information that the gods gave, which often had a hidden meaning 3 [usuallysing.] a person or book that gives valuable advice or information: My sister's the oracle on investment matters.