English Words Starting With O

• osteichthyan

  nounVery Low
  /ˌɒstɪˈɪkθɪən/Any fish belonging to the class Osteichthyes, characterized by a bony skeleton, as opposed to cartilaginous fish like sharks.
• osteichthyes

  nounVery Low (Specialist)
  /ˌɒstɪˈɪkθɪiːz/A major taxonomic class of vertebrates comprising all bony fish.
• osteitis

  nounC2
  /ˌɒstiˈaɪtɪs/inflammation of bone
• osteitis deformans

  nounC2/Medical Specialist
  /ˌɒstiˈaɪtɪs dɪˈfɔːmænz/A chronic bone disease characterized by excessive breakdown and regrowth of bone tissue, leading to bone deformation, pain, and increased risk of fracture.
• ostend

  nounRare
  /ɒˈstɛnd/To show or point out; to exhibit; to manifest.
• ostend manifesto

  nounVery Low
  /ˌɒsˈtɛnd ˌmæn.ɪˈfɛs.təʊ/A historical political document issued in the 1850s outlining American foreign policy goals, particularly regarding Cuba.
• ostensive definition

  nounC2
  /ɒˈstɛnsɪv ˌdɛfɪˈnɪʃ(ə)n/A definition that points to or demonstrates the thing being defined, rather than describing it with words.
• ostensorium

  nounVery Low (Rare, Specialised)
  /ˌɒstɛnˈsɔːrɪəm/A liturgical vessel, typically made of gold or silver, used in Roman Catholic and Anglican churches to display the consecrated Eucharistic host for veneration, especially during Benediction.
• ostensory

  nounExtremely Rare / Obscure
  /ɒˈstɛns(ə)ri/a transparent container, often made of gold or silver, in which the consecrated Host (communion bread) is displayed for veneration in Roman Catholic and some other Christian churches.
• ostentation

  nounC1/C2
  /ˌɒstenˈteɪʃn/Excessive display of wealth, knowledge, or skill, intended to impress others.
• osteoarthritis

  nounC1
  /ˌɒstɪəʊɑːˈθraɪtɪs/A degenerative joint disease caused by the breakdown of joint cartilage and the underlying bone.
• osteoarthrosis

  nounRare
  /ˌɒstɪəʊɑːˈθrəʊsɪs/A chronic degenerative joint disease, primarily involving the cartilage.
• osteoblast

  nounC2/Highly Technical
  /ˈɒstɪə(ʊ)blɑːst/A cell that forms new bone tissue.
• osteochondritis

  nounVery Low
  /ˌɒstɪəʊkɒnˈdraɪtɪs/An inflammatory condition affecting both bone and cartilage.
• osteochondrosis

  nounC2 / Very Low-Frequency
  /ˌɒstɪəʊkɒnˈdrəʊsɪs/A group of disorders affecting the growth or ossification (turning into bone) of the cartilage in children and adolescents, primarily at joint surfaces or growth plates.
• osteoclasis

  nounC2
  /ˌɒstɪˈɒkləsɪs/The surgical procedure of breaking a bone to correct a deformity or realign it.
• osteoclast

  nounC2
  /ˈɒstɪə(ʊ)klɑːst/A specialized bone cell that breaks down bone tissue, a process essential for bone remodeling and repair.
• osteocope

  nounExtremely Rare
  /ˈɒstɪəˌkəʊp/A severe, deep-seated pain in the bones.
• osteocyte

  nounVery Low
  /ˈɒstiəsʌɪt/A mature bone cell, embedded within the bone matrix.
• osteofibrosis

  nounVery low frequency
  /ˌɒstiəʊfaɪˈbrəʊsɪs/A pathological condition characterized by the abnormal hardening and increased density of bone tissue due to the excessive formation of fibrous connective tissue within the bone.

Showing 2221–2240 of 3187 words.