English Words Starting With O

• oesophagoscope

  nounVery Low
  /iːˈsɒfəɡəskəʊp/A medical instrument, a type of endoscope, used for visually examining the interior of the oesophagus (gullet).
• oesophagus

  nounC1
  /iːˈsɒfəɡəs/The muscular tube connecting the throat to the stomach, through which food passes.
• oestradiol

  nounC2
  /ˌiːstrəˈdʌɪɒl/A primary female sex hormone, the major and most potent natural form of oestrogen, produced mainly by the ovaries.
• oestrin

  nounRare
  /ˈiːstrɪn/ or /ˈɛstrɪn/An obsolete or variant spelling of 'estrone', a weak oestrogen (estrogen) hormone secreted by the ovaries.
• oestriol

  nounC2
  /ˈiːstrɪɒl/A weak, naturally occurring estrogen (female sex hormone) produced during pregnancy, primarily by the placenta.
• oestrogen

  nounC1
  /ˈiːstrədʒ(ə)n/A primary female sex hormone, crucial for the development and regulation of the female reproductive system and secondary sexual characteristics.
• oestrone

  nounLow
  /ˈiːstrəʊn/A specific type of estrogen, a female sex hormone produced mainly by the ovaries.
• oestrous cycle

  nounC2
  /ˈiːstrəs ˈsaɪkl̩/The recurring physiological changes in reproductive females of most placental mammals that are induced by reproductive hormones, from one period of oestrus (sexual receptivity) to the next.
• oestrus

  nounC2 / Very Rare (Specialist)
  /ˈiːstrəs/A recurring period of heightened sexual receptivity and fertility in most female mammals, culminating in ovulation.
• oeuvre

  nounC2
  /ˈɜːvrə/The complete works of a writer, painter, musician, or other artist, regarded collectively.
• of human bondage

  nounLow
  /əv ˌhjuːmən ˈbɒndɪdʒ/A state of being bound, enslaved, or controlled by human limitations, desires, or societal constraints; the condition of lacking freedom due to human nature or circumstance.
• of mice and men

  nounLow
  /əv maɪs ənd men/A phrase referencing John Steinbeck's 1937 novella, used to allude to themes of fragile dreams, futile plans, or the harsh contrast between aspirations and reality.
• of time and the river

  nounlow
  /əv ˈtaɪm ən(d) ðə ˈrɪv.ər/A reference to the passage and inevitable flow of time and existence.
• ofay

  nounVery Low / Obsolete
  /ˈəʊ.feɪ/A derogatory slang term used by some Black Americans to refer to a white person.
• off

  adjectiveadverbnounprepositionverbverb-intransitiveverb-transitiveA1
  /ɒf/Indicates separation, departure, disconnection, or a state of being away from a previous position or condition.
• off break

  nounLow
  /ˌɒf ˈbreɪk/In cricket, a type of delivery (a 'break') bowled by a right-arm spin bowler which turns from the off side into the right-handed batter (i.e., from left to right as viewed by the bowler).
• off broadway

  adjectivenounC1
  /ˌɒf ˈbrɔːdweɪ/Theatre: A designation for theatrical productions in New York City that are staged in smaller, more intimate venues than those on Broadway itself, often characterized by lower production costs, more experimental works, and emerging talent.
• off chance

  nounB2
  /ɒf ˈtʃɑːns/a slight possibility; an unlikely or improbable event or circumstance
• off off broadway

  adjectivenounLow
  /ˌɒf ɒf ˈbrɔːdweɪ/Theatrical productions that are more experimental, avant-garde, and produced on an even smaller scale and with lower budgets than 'off-Broadway'.
• off stump

  nounLow frequency (Specialist term)
  /ˌɒf ˈstʌmp/In cricket, the stump on the off side of the batsman's wicket, i.e., the stump furthest from the batsman's legs when in a right-handed stance.

Showing 521–540 of 3187 words.