substation
Concise Oxford English Dictionary © 2008 Oxford University Press:
substation/ˈsʌbsteɪʃn/
▶noun
- 1 a set of equipment reducing the high voltage of electrical power transmission to that suitable for supply to consumers.
- 2 a subordinate police station or fire station.
- 3 N. Amer. a small local post office.
'substation' also found in these Oxford entries:

