English Words Starting With O

• oldster

  nounLow
  /ˈəʊl(d)stə/An older person.
• olduvai gorge

  nounC1/C2
  /ˌɒl.də.vaɪ ˈɡɔːdʒ/A specific archaeological site in Tanzania, East Africa, famous for its early human fossils and stone tools.
• oldwife

  nounC2 (Extremely rare)
  /ˈəʊldwaɪf/A type of fish (Enoplosus armatus) found in Australian waters, also a name for various unrelated fish species in other regions.
• oldy

  nounLow-frequency
  /ˈəʊldi/An informal and often affectionate term for something (or someone) that is old-fashioned, dated, or belongs to an earlier era.
• olea

  nounVery Low
  /ˈəʊlɪə/A genus of trees and shrubs in the olive family (Oleaceae), primarily comprising the olive tree (Olea europaea).
• olean

  nounLow
  /ˈəʊ.li.æn/A synthetic fat substitute (olestra) used in some processed foods, designed to pass through the body without being absorbed.
• oleander

  nounC1
  /ˌəʊliˈændə/A poisonous evergreen shrub with clusters of fragrant, showy pink, white, or red flowers, native to the Mediterranean and widely cultivated.
• olearia

  nounVery Low Frequency
  /ˌəʊliˈeərɪə/A genus of flowering plants in the daisy family, comprising mostly Australian and New Zealand shrubs and small trees.
• oleaster

  nounC2
  /ˌəʊlɪˈastə/A shrub or small tree of the genus Elaeagnus, often with silvery leaves and edible olive-like fruit.
• oleate

  nounC2
  /ˈəʊlɪeɪt/A salt or ester of oleic acid.
• olecranon

  nounC2 (Very Low Frequency)
  /ˌɒlɪˈkreɪnɒn/The bony prominence at the upper end of the ulna, forming the point of the elbow.
• oled

  abbreviationnounlow
  /ˌəʊɛlˈiː ˈdiː/A type of flat-panel display technology that uses organic compounds which emit light when an electric current is applied. Each pixel is self-illuminating, requiring no backlight.
• olefiant gas

  nounExtremely Rare / Obsolete
  /əʊˈliːfɪənt ɡæs/A historical name for ethylene (C₂H₄), a colorless flammable gas with a faint sweet smell.
• olefin

  nounLow
  /ˈɒlɪfɪn/Any of a class of unsaturated hydrocarbons containing at least one carbon-carbon double bond.
• olefin fiber

  nounLow
  /ˈəʊlɪfɪn ˈfaɪbə/A synthetic fiber made from polymers derived from petroleum, primarily polyolefins like polypropylene or polyethylene, known for its strength, light weight, and chemical resistance.
• olefin series

  nounC2
  /ˈəʊlɪfɪn ˈsɪəriːz/A group of unsaturated hydrocarbons containing at least one carbon-carbon double bond, with the general formula CₙH₂ₙ.
• olefine

  nounC2
  /ˈəʊləfiːn/An unsaturated hydrocarbon containing one or more carbon-carbon double bonds (especially an alkene).
• oleic acid

  nounC2
  /əʊˌliːɪk ˈæsɪd/A monounsaturated fatty acid, found naturally in various animal and vegetable fats and oils, especially olive oil.
• olein

  nounRare (C2+)
  /ˈəʊliɪn/A liquid fraction of natural fats and oils, primarily composed of triglycerides of oleic acid and other unsaturated fatty acids.
• olekma

  nounNon-existent/Obscure
  This word does not exist in English vocabulary. It appears to be a made-up or misspelled term with no established meaning.

Showing 941–960 of 3187 words.