underfrequency relay
noun
: a relay actuated by a fall in electrical frequency
Word History
Etymology
under entry 3 + frequency
- out of humor
- out of it
- out of joint
- out of keeping with
- out of kilter
- out of line
- out of luck
- out of necessity
- safety straps
- safety switch
- safety switchboard
- safety tread
- safety tube
- safety valve
- safety valves
- safety zone
- safety-deposit
- safety-fund system
- safety/strength in numbers
- safetying
- safetyman
- safetymen
- saffi
- saffian
- saffians