gaslight

noun

1. light produced by the combustion of illuminating gas.
2. a gas burner or gas jet for producing this kind of light.

adjective

3. gaslit(def 2).

verb (used with object), gas·light·ed or gas·lit, gas·light·ing.

4. to cause (a person) to doubt his or her sanity through the use of psychological manipulation: How do you know if your partner is gaslighting you?

noun

1. a type of lamp in which the illumination is produced by an incandescent mantle heated by a jet of gas
2. the light produced by such a lamp