English Words Starting With O

• oriental cockroach

  nounlow
  /ˌɔː.riˈen.təl ˈkɒk.rəʊtʃ/A species of cockroach (Blatta orientalis) that is dark brown to black, often found in cool, damp locations.
• oriental emerald

  nounLow
  /ˌɔː.riˈen.təl ˈem.ə.rəld/A rare, valuable deep green variety of corundum (the same mineral as ruby and sapphire), often considered a precious gemstone when of high quality. It is an aluminium oxide (Al2O3) with trace amounts of chromium that create the green colour.
• oriental fruit moth

  nounRare
  /ˌɔː.riˌen.təl ˈfruːt ˌmɒθ/A species of moth (Grapholita molesta), native to Asia, whose larvae are a major pest of stone fruit and pome fruit trees.
• oriental poppy

  nounC1
  /ˌɔː.riˌen.təl ˈpɒp.i/A tall, herbaceous perennial plant (Papaver orientale) known for its large, showy flowers with a dark center, commonly grown in gardens.
• oriental rug

  nounC1
  /ˌɔː.riˈen.təl ˈrʌɡ/A hand-knotted carpet or rug traditionally made in regions of Asia, including Persia (Iran), Turkey, the Caucasus, Central Asia, and parts of the Indian subcontinent.
• oriental topaz

  nounRare / Specialized
  /ˌɔː.riˈen.təl ˈtəʊ.pæz/A historical or trade term for a variety of corundum (sapphire) that is yellow, orange, or reddish-brown in color, and is not a true topaz.
• orientalia

  plural-nounLow (C2)
  /ˌɔː.ri.enˈteɪ.li.ə/Materials from or related to the East (especially East Asia); Asian studies or Asian artefacts.
• orientalism

  nounlow
  /ˌɔː.riˈen.təl.ɪ.zəm/The Western study and representation of Eastern cultures, often characterized by stereotyping, exoticism, and colonial attitudes.
• orientalize

  verbverb-ambitransitiveRare/Low-Frequency
  /ˌɔːrɪˈɛntəlaɪz/To give Eastern or Asian characteristics to something; to make something conform to Eastern styles, customs, or ideas.
• orientate

  verbverb-ambitransitiveB2
  /ˈɔːrɪənteɪt/To determine one's position or direction in relation to surroundings; to align or position something towards a particular point.
• orientation

  nounB2
  /ˌɔː.ri.enˈteɪ.ʃən/The determination or alignment of one's position, direction, or purpose relative to something else; a person's basic attitude, beliefs, or feelings.
• oriente

  nounVery Low / Archaic
  /ˌɔːrɪˈɛnteɪ/to face towards, or align with, the east; to be directed or positioned with reference to the east.
• orienteer

  nounverbLow
  /ˌɔː.ri.ənˈtɪə/To take part in the sport of orienteering, which involves navigating between checkpoints across unfamiliar terrain using a map and compass.
• orienteering

  nounC1
  /ˌɔːrɪənˈtɪərɪŋ/A competitive sport where participants navigate through unfamiliar terrain using a map and compass to find a series of checkpoints.
• orifice

  nounC1/C2
  /ˈɒr.ɪ.fɪs/An opening or hole, especially in the body of a living organism.
• orifice meter

  nounRare
  /ˈɒr.ɪ.fɪs ˌmiː.tə/A device used in fluid mechanics to measure flow rate by creating a pressure drop across a constriction (orifice plate) in a pipe.
• oriflamme

  nounC2 (Very Low Frequency / Literary)
  /ˈɒrɪflam/A historically significant banner, especially the red banner of the Abbey of Saint Denis, used as the royal standard of the French kings; more broadly, any banner, standard, or symbol that serves as a rallying point or guiding principle.
• origami

  nounB2
  /ˌɒr.ɪˈɡɑː.mi/The Japanese art of folding paper into decorative shapes and figures.
• origan

  nounLow
  /ˈɒrɪɡən/A perennial herb of the mint family, closely related to marjoram, used as a culinary and medicinal herb.
• origanum

  nounLow
  /ɒˈrɪɡənəm/A genus of aromatic perennial herbs in the mint family (Lamiaceae), including marjoram and oregano.

Showing 1921–1940 of 3187 words.