Ordnance datum
noun
1.
mean sea level calculated from observation taken at Newlyn, Cornwall, and used as the official basis for height calculation on British maps OD
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- Ordnance survey
noun 1. the official map-making body of the British or Irish government
- Ordo
[awr-doh] /ˈɔr doʊ/ noun, plural ordines [awr-dn-eez] /ˈɔr dnˌiz/ (Show IPA) 1. Roman Catholic Church. a booklet containing short and abbreviated directions for the contents of the office and Mass of each day in the year. [noh-woo s ohr-doh se-kloh-roo m; English noh-vuh s awr-doh se-klawr-uh m, -klohr-] /ˈnoʊ wʊs ˈoʊr doʊ sɛˈkloʊ rʊm; English […]
- Ordonnance
[awr-dn-uh ns; French awr-daw-nahns] /ˈɔr dn əns; French ɔr dɔˈnɑ̃s/ noun, plural ordonnances [awr-dn-uh n-siz; French awr-daw-nahns] /ˈɔr dn ən sɪz; French ɔr dɔˈnɑ̃s/ (Show IPA) 1. the arrangement or disposition of parts, as of a building, picture, or literary work. 2. an ordinance, decree, or law. /ˈɔːdənəns; French ɔrdɔnɑ̃s/ noun 1. the proper disposition […]
- Ordovician
[awr-duh-vish-uh n] /ˌɔr dəˈvɪʃ ən/ Geology adjective 1. noting or pertaining to a geologic period of the Paleozoic Era, from 500 million to 425 million years ago, notable for the advent of fish. noun 2. the Ordovician Period or System. /ˌɔːdəʊˈvɪʃɪən/ adjective 1. of, denoting, or formed in the second period of the Palaeozoic era, […]
- Ordos
[awr-dos] /ˈɔr dɒs/ noun 1. a desert plateau in the S Inner Mongolian Autonomous Region in N China. About 35,000 sq. mi. (90,650 sq. km).