English Words Starting With M

• mare cimmerium

  nounVery Low
  /ˌmɑːreɪ sɪˈmɛərɪəm/A named surface feature (a dark region) on the planet Mars; a specific 'sea' in the Martian nomenclature.
• mare clausum

  nounVery low (C2/professional)
  /ˌmɑːreɪ ˈklaʊsʊm/A sea or maritime zone that is closed to international navigation or other uses by one nation, based on claims of sovereignty.
• mare crisium

  nounC1
  /ˌmɑːreɪ ˈkrɪsɪəm/A prominent lunar mare (dark, flat plain of solidified lava) on the near side of the Moon, located in the Moon's northeast quadrant.
• mare erythraeum

  nounVery Low
  /ˌmɑːreɪ ˌɛrɪˈθriːəm/A large, dark albedo feature on the surface of the planet Mars, historically observed through telescopes.
• mare fecunditatis

  nounSpecialist / Rare
  /ˌmɑːreɪ ˌfɛkʌndɪˈtɑːtɪs/A large, dark, basaltic plain on the near side of the Moon, officially designated a "lunar mare".
• mare frigoris

  nounC1
  /ˌmɑːreɪ frɪˈɡɔːrɪs/A large lunar mare ("sea") on the Moon, named 'Sea of Cold'.
• mare humorum

  nounVery Low
  /ˌmɑːreɪ hjuːˈmɔːrəm/A lunar mare, or dark basaltic plain, on the Moon.
• mare imbrium

  nounRare
  /ˌmɑːreɪ ˈɪmbriəm/A large, dark lunar plain formed by a massive ancient asteroid impact, perceived as a 'sea' before the nature of the Moon was understood.
• mare island

  nounLow (as a proper noun); Very Low (as a parsed common noun phrase)
  /ˌmɛːr ˈaɪlənd/A proper noun referring to a specific island in San Francisco Bay, California, historically significant as a U.S. Navy shipyard.
• mare liberum

  nounC2
  /ˌmɑːreɪ ˈlɪbərʊm/The principle in international law that the sea is free and open to all nations for navigation and trade.
• mare nectaris

  nounRare
  /ˌmɑːreɪ ˈnɛktərɪs/A dark basaltic plain on the Moon's surface, officially designated as a 'lunar mare'.
• mare nostrum

  nounVery Low
  /ˌmɑːreɪ ˈnɒstrəm/Latin phrase meaning 'our sea', historically used to refer to the Mediterranean Sea, particularly by the Roman Empire.
• mare nubium

  nounVery Low
  /ˌmɑːreɪ ˈnjuːbiəm/A large, dark basaltic plain on the Moon, named 'Sea of Clouds' in Latin.
• mare serenitatis

  nounC2
  /ˌmɑːreɪ ˌsɛrənɪˈtɑːtɪs/A specific dark, basaltic plain (a lunar mare) on the Moon's surface.
• mare sirenum

  nounExtremely Rare
  /ˌmɑːreɪ sɪˈreɪnəm/A specific, large, dark albedo feature (region) on the surface of Mars.
• mare tranquillitatis

  nounC2
  /ˌmɑːreɪ ˌtræŋˌkwɪlɪˈtɑːtɪs/A large, dark basaltic plain on the Moon, named the 'Sea of Tranquility' in Latin.
• mare tyrrhenum

  nounVery Low
  /ˌmɑːreɪ tɪˈriːnəm/A lunar mare (dark plain) on the near side of the Moon, named after the Tyrrhenian Sea on Earth.
• mare undarum

  nounVery Low
  /ˌmɑːreɪ ʌnˈdɑːrʊm/A dark, flat, basaltic plain on the Moon, specifically the 'Sea of Waves'.
• mare vaporum

  nounVery Low
  /ˈmɑːreɪ vɑːˈpɔːrəm/A large, flat, dark plain on the Moon's surface, now known to be composed of ancient solidified basaltic lava flows.
• mare's-nest

  nounC1/C2
  /ˈmeəz nɛst/An apparent discovery that turns out to be a hoax or a mistake; something thought to be wonderful that proves to be worthless.

Showing 1781–1800 of 8594 words.