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plural decimetres
(metrology) An SI unit of length equal to 10−1 metres. Symbol: dm quotations
If the aquarium is placed where it receives insufficient daylight, artificial lighting by means of ordinary incandescent lamps should be employed. For good plant growth 2 decalumens of luminous flux per square decimetre of water surface […]
1956, C. van Duijn, Diseases of Fishes, page 149