decimetre

Etymology

From French décimètre, deci- + metre.

noun

  1. (metrology) An SI unit of length equal to 10⁻¹ metres. Symbol: dm
    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

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