ODN

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Archived revision by Vealhurl (talk | contribs) as of 12:59, 18 November 2019.
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See also: ódn

English

Noun

ODN

  1. (UK) Initialism of ordnance datum Newlyn. Used to judge the height above/below sea level in England, from the MSL (mean sea level) in Newlyn between 1915 and 1921.

Anagrams