English Words Starting With O

• ocular

  adjectivenounC1
  /ˈɒk.jə.lər/Relating to the eye or vision.
• ocularist

  nounVery Low Frequency
  /ˈɒk.jə.lə.rɪst/A specialist who designs, manufactures, and fits artificial eyes (prosthetic eyes).
• oculist

  nounVery Low
  /ˈɒkjʊlɪst/A dated or historical term for a medical doctor who specializes in the treatment of diseases and defects of the eye.
• oculoauriculovertebral dysplasia

  nounVery Low
  /ˌɒkjʊləʊɔːˌrɪkjʊləʊvɜːtɪbrəl dɪsˈpleɪzɪə/A rare congenital disorder affecting the development of the eyes, ears, and spine.
• oculomotor nerve

  nounC2
  /ˌɒkjʊləʊˈməʊtə nɜːv/The third cranial nerve, which controls most of the muscles that move the eyeball and upper eyelid, and is involved in pupil constriction and lens accommodation.
• oculus

  nounC2
  An eye or an eye-like opening.
• oda

  abbreviationnounVery Low / Rare
  /ˈəʊdə/A historical term for a room, often a private chamber or apartment, especially in a Turkish or Ottoman household.
• oda nobunaga

  nounLow
  /ˌəʊ.də ˌnɒb.ʊˈnɑː.ɡə/A specific historical figure from Japan's Sengoku period.
• odah

  nounLow (rare, informal)
  /ˈəʊdə/Interjection expressing sudden realization, surprise, or mild disappointment, akin to 'oh dear' or 'uh-oh'.
• odalisque

  nounRare
  /ˈəʊdəlɪsk/A female slave or concubine in a harem, especially in the former Ottoman Empire.
• odd

  adjectivenounB1
  /ɒd/strange or unusual; different from what is normal or expected
• odd fellow

  nounC1/C2 (Low-Frequency Lexical Item)
  /ˌɒd ˈfel.əʊ/A person who is strange, peculiar, or unconventional in their behavior, appearance, or habits.
• odd lot

  nounC1/C2
  /ˌɒd ˈlɒt/A quantity of goods or shares that is less than the standard trading unit or batch.
• odd man out

  nounC1
  /ˌɒd ˌmæn ˈaʊt/A person or thing that is different from the others in a group and doesn't fit in or belong.
• odd number

  nounIntermediate (B1)
  /ˌɒd ˈnʌm.bər/An integer that is not divisible by two without leaving a remainder.
• odd or even

  nounC1
  /ˈɒd ɔːr ˈiːv(ə)n/A binary classification system for whole numbers: 'odd' numbers (1, 3, 5...) cannot be divided exactly by 2, while 'even' numbers (2, 4, 6...) can be divided exactly by 2.
• odd permutation

  nounC2
  /ˌɒd ˌpɜː.mjʊˈteɪ.ʃən/In mathematics, a permutation that can be expressed as the product of an odd number of transpositions (pairwise swaps).
• odd trick

  nounLow
  /ɒd trɪk/In contract bridge, a trick won by declarer beyond the number required by the contract.
• odd-even check

  nounC2 (Very low frequency; highly specialized technical term)
  /ˈɒd iːv(ə)n ˈtʃɛk/A form of parity check, typically in computing or data transmission, where an extra bit is added to a binary sequence to make the total number of 1-bits either always odd (odd parity) or always even (even parity), used to detect single-bit errors.
• odd-job

  verb-intransitiveB1 (Intermediate)
  /ˌɒd ˈdʒɒb/a piece of casual, small, unskilled work, often of a temporary nature and not part of a regular job.

Showing 421–440 of 3187 words.