downconversion
(organic chemistry) A bicyclic heterocycle composed of a benzene ring fused to an oxazepine ring; any derivative of this compound
(physics) The interaction of a photon with a medium in which it is converted into two photons of lower frequencies such that energy is conserved.
A layer or rank, especially of seats or a wedding cake.
(architecture) A protective moulding over a door or window that allows rain to drip away from the structure. / A water filter in which impurities are removed by running water through a porous stone.
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