You searched for: “either
either, ether
either (EE thuhr, IGH ther) (pronoun)
One or the other of two items or of two groups: Mike will need to choose either toast and tea or eggs and ham for breakfast.
ether (EE thuhr) (noun)
A volatile, highly flammable liquid, used chiefly in industry and as an anesthetic: The doctor used ether so the patient was asleep during the operation.

The patient was faced with a choice; either the doctor could use ether or a local anesthetic for the minor operation.