English Words Starting With O

• ovipositor

  nounC2
  /ˌəʊvɪˈpɒzɪtə/A specialized organ in many female insects and some other animals used for depositing eggs.
• ovisac

  nounVery low
  /ˈəʊvɪsæk/A sac or capsule containing an ovum or egg, especially in invertebrates.
• ovo-lacto-vegetarian

  nounC1/C2
  /ˌəʊ.vəʊˌlæk.təʊ ˌvedʒ.ɪˈteə.ri.ən/A person who does not eat meat or fish, but does consume eggs (ovo) and dairy products (lacto).
• ovoid

  adjectivenounLow-Frequency
  /ˈəʊ.vɔɪd/Having an egg-shaped outline or form; shaped like an egg.
• ovolactarian

  nounLow
  /ˌəʊvəʊlækˈteəriən/A person who consumes eggs and dairy products but no meat.
• ovolo

  nounC2/Proficient
  /ˈɒvələʊ/A rounded convex moulding, often found in classical architecture.
• ovonic

  adjectivenounVery Low
  /əʊˈvɒnɪk/Relating to a type of electronic switching or memory device that relies on a rapid, reversible change in the electrical resistance of a material.
• ovonics

  nounLow
  /əʊˈvɒn.ɪks/The study and technology of electronic devices that operate through the reversible switching of materials between amorphous and crystalline states, particularly thin films of chalcogenide glass.
• ovotestis

  nounVery Low (Highly specialized, technical)
  /ˌəʊ.vəʊˈtɛs.tɪs/A hermaphroditic reproductive organ that contains both ovarian and testicular tissue, typically found in certain invertebrates and in some abnormal developmental conditions in vertebrates.
• ovovitellin

  nounVery Rare / Technical / Specialized
  /ˌəʊvəʊvʌɪˈtɛlɪn/The main protein found in egg yolk.
• ovshinsky effect

  nounVery Low (C2+)
  /ɒvˈʃɪnski ɪˈfɛkt/A specific physical phenomenon in amorphous semiconductors where an applied electric field causes a sudden, reversible, and persistent change from a high-resistance state to a low-resistance state.
• ovulate

  verbverb-intransitiveC1
  /ˈɒv.jʊ.leɪt/To release an egg (ovum) from the ovary, as part of the female reproductive cycle.
• ovulation method

  nounLow
  /ˌɒvjʊˈleɪʃən ˈmeθəd/A family planning technique that involves tracking a woman's menstrual cycle and signs of ovulation to identify fertile days.
• ovule

  nounLow
  /ˈɒvjuːl/The structure in seed plants that develops into a seed after fertilization; the female reproductive cell in plants.
• ovum

  nounC1
  /ˈəʊvəm/A mature female reproductive cell (gamete) in animals; an egg cell.
• owatonna

  nounVery Low
  /ˌəʊwəˈtɒnə/A place name; a city in Steele County, Minnesota, United States.
• owe

  verbverb-intransitiveverb-transitiveB1
  /əʊ/To be under an obligation to pay or repay (money, a favour, gratitude) to someone.
• owelty

  nounVery Low / Obsolete
  /ˈəʊəlti/Equality or parity, particularly in the context of a financial or compensatory payment made between parties to equalise the value of exchanged properties or shares.
• owen

  nounLow
  /ˈəʊɪn/Proper noun, primarily a male given name of Welsh origin meaning "young warrior" or "well-born".
• owen gun

  nounVery Low
  /ˈəʊ.ɪn ˌɡʌn/A distinctive Australian submachine gun designed and manufactured during World War II.

Showing 2981–3000 of 3187 words.