English Words Starting With O

• oose

  nounRare/Regional
  /uːs/A Scottish and Northern English dialect term for house dust, fluff, or the dusty accumulation of fibers and particles.
• oosperm

  nounVery Rare / Technical
  /ˈəʊə(ʊ)ˌspɜːm/A fertilized egg cell; a zygote.
• oosphere

  nounVery Low
  /ˈəʊə(ʊ)ˌsfɪə/A large, non-motile female gamete (egg cell) in certain algae, fungi, and plants that is fertilized to form an oospore.
• oospore

  nounRare
  /ˈəʊə(ʊ)ˌspɔː/A thick-walled, resting spore formed by the fertilization of an oosphere in certain algae and fungi.
• oost

  nounVery low
  /əʊst/A point of the compass, specifically east.
• oostende

  nounLow
  /ɒˈstɛnd/A major city and coastal resort on the North Sea coast of Belgium.
• ootheca

  nounVery low (Specialist)
  /ˌəʊəˈθiːkə/The egg case or capsule produced by certain insects and molluscs.
• ootid

  nounTechnical/Low
  /ˈəʊtɪd/The haploid cell resulting from the final stage of oogenesis in animals, immediately before it matures into an ovum (egg cell).
• ooze

  nounverbverb-intransitiveverb-transitiveC1
  /uːz/To flow slowly or seep out gradually, often of a thick or viscous liquid; or the slow, gradual flow itself.
• ooze leather

  nounLow
  /uːz ˈlɛðə/A type of soft, pliable leather with a characteristic velvety or suede-like surface finish, traditionally tanned with fish oil, giving it a distinctive texture.
• op art

  nounC2
  /ˈɒp ɑːt/A style of visual art that uses optical illusions and geometric patterns to create effects of movement, vibration, or flashing colour.
• op-ed

  nounC1
  /ˌɒp ˈed/A newspaper article, typically printed opposite the editorial page, expressing a personal opinion on a current issue, often by a guest writer.
• op-shop

  nounMedium frequency
  A shop selling second-hand clothing and household items, typically run by a charity.
• opa-locka

  nounC2
  /ˌəʊpə ˈlɒkə/A proper noun referring to a city in Miami-Dade County, Florida, United States.
• opacify

  verb-intransitiveverb-transitiveLow
  /əʊˈpæsɪfaɪ/To make opaque or cloudy; to become opaque or less transparent.
• opacity

  nounC1
  /əʊˈpæs.ə.ti/The quality of being opaque; the degree to which something blocks light.
• opah

  nounLow
  /ˈəʊpə/A large, deep-bodied, colorful pelagic fish (Lampris guttatus) found in temperate and tropical oceans, notable for being warm-blooded.
• opal

  nounC1
  /ˈəʊp(ə)l/A precious stone consisting of a form of hydrated silica, typically semi-transparent and showing varying colours against a pale or dark ground.
• opal glass

  nounLow
  /ˈəʊpəl ɡlɑːs/A type of white, translucent, or semi-translucent glass, often with a milky, clouded appearance, produced by adding certain opacifying agents during manufacture.
• opalesce

  verb-intransitiveC2
  /ˌəʊ.pəlˈɛs/to exhibit a play of colors like an opal; to become iridescent.

Showing 1301–1320 of 3187 words.