fountain lamp noun2 •A lamp that consists of a large number of fiber optic tubes that mimic the spray of water from a fountain.A familiar application is the fountain lamp that has several hundred fibers spraying out of the top. — 1989 •(historical) A lamp fed with oil from an elevated reservoir.The flame generally used in reflectors is from an Argand fountain lamp, the wick of which is one inch in diameter. — 1854 formsfountain lamps