colour light signal
(US color light signal) Railways
noun
An electric fixed signal which gives instructions to the train driver by the colour of the light displayed, rather than by the position of the lights.
Origin
Early 20th century; earliest use found in Index to Signal Literature.
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- alkalifying
- alkaligen
- alkaligene
- alkaligenous
- alkali metal
- alkalimeter
- alkalimetric
- alkalimetrically
- alkalimetry
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- alkaline cell
- alkaline earth
- alkaline earth metal
- alkaline metal
- alkaline phosphatase
- alkalinity
- alkalinization
- alkalinous
- alkali salt
- alkalise
- alkali soil
- alkali waste