O
- obesity (ō-BĒ-sĭt-ē):
- Abnormal increase in the proportion of fat cells resulting in excess body weight for height.
- obstetrician (ob-stĕ-TRISH-ăn):
- The person who specializes in the study of obstetrics and gynecology and are referred to as OB/GYN Obstetrics and Gynecology.
- Obstetrics (ŏb-STE-triks):
- Medical specialty dealing with pregnancy, childbirth, and puerperium.
- occipital lobe (ok-SIP-ĭt-ăl lōb):
- Region of the cerebral cortex directly beneath the occipital bone of the cranium.
- occlude (ŏ-KLOOD):
- Block or close tightly.
- oculomycosis (ŏk-ū-lō-mī-KŌ-sĭs):
- Abnormal condition of the eye caused by a fungus.
- olfaction (ŏl-FĂK-shŭn):
- Special sense responsible for smell, which has a unique, direct connection to the cerebrum.
- oligodendrocyte (ol-ĭ-gō-DEN-drŏ-sīt):
- Glial cell type in the CNS that provides the myelin insulation for axons in tracts.
- oligohydramnios (ŏl-ĭg-ō-hī-DRĂM-nē-ōs):
- A condition where there is minimal amniotic fluid within the placental sac. Too little fluid can restrict the fetus from movement and growth.
- oligomenorrhea (ŏl-ĭ-gō-mĕn-ō-RĒ-ă):
- Infrequent or irregular periods.
- oligoovulation (ol-i-gō-ov-yŭ-LĀ-shŏn):
- Infrequent ovulation.
- oligospermia (ŏl-ĭ-gō-SPĔR-mē-ă):
- Condition of scanty sperm.
- oliguria (ŏl-ĭg-Ū-rē-ă):
- Scanty urine (output).
- omentum (ō-MENT-ŭm):
- Fatty tissue that stretches over the abdomen, plays a role in immune response and the growth of certain cancers.
- omphalitis (ŏm-făl-Ī-tĭs):
- Inflammation of the umbilicus.
- omphalocele (ŏm-FĂL-ō-sēl):
- Herniation of the umbilicus.
- onychocryptosis (ŏn-ĭ-kō-krip-TŌ-sis):
- Abnormal condition of a hidden nail.
- onychomalacia (ŏn-ĭ-kō-mă-LĀ-shă):
- Softening of the nails.
- onychomycosis (on-i-kō-mī-KŌ-sĭs):
- Abnormal condition of a fungus in the nails.
- onychophagia (ŏn-ĭ-KŎF-ă-jē):
- Eating the nails (nail biting).
- oocyte (Ō-ŏ-sīt):
- Female gamete.
- oophorectomy (ō-ŏ-fŏ-REK-tŏ-mē):
- Surgical removal of the fallopian/uterine tubes.
- oophoritis (ō-ŏf-ō-RĪ-tĭs):
- Inflammation of the ovary.
- ophthalmalgia (ŏf-thăl-MĂL-jē-ă):
- Pain in the eye.
- ophthalmia neonatorum (of-THAL-mē-ă nē-ŏ-NĂ-tōr-ăm):
- Conjunctivitis in newborns (severe).
- ophthalmic (of-THAL-mik):
- Pertaining to the eye.
- ophthalmologist (ŏf-thăl-MŎL-ō-jĭst):
- Specialist of the eye.
- ophthalmology (Ophth) (ŏf-thăl-MŎL-ō-jē):
- Study of the eye.
- ophthalmopathy (ŏf-thăl-MŎP-ă-thē):
- Disease of the eye.
- ophthalmoplegia (of-thal-mō-PLĒ-j(ē-)ă):
- Paralysis of the eye.
- ophthalmoscope (of-THAL-mŏ-skōp):
- Instrument used to view the eye.
- ophthalmoscopy (of-thal-MOS-kŏ-pē):
- Process of viewing the eye.
- opsonization (ŏp-să-nĭ-ZĀ-shŭn):
- An antibody or an antimicrobial protein binds to a pathogen, thereby marking it as a target for phagocytes.
- optic (OP-tik):
- Pertaining to vision.
- Optician (ŏp-TĬSH-ăn):
- Specialist who fills prescriptions for lenses but cannot prescribe.
- Optometrist (ŏp-TŎM-ĕ-trĭst):
- Specialist who diagnoses, treats and manages diseases and disorders of the eye (Doctor of Optometry).
- optometry (op-TOM-ĕ-trē):
- Measuring vision.
- oral (ŌR-ăl):
- Pertaining to the mouth.
- orchialgia (or-kē-ĂL-jē-ă):
- Pain in the testis.
- orchiditis (or-kĭ-DĪ-tĭs):
- Inflammation of the testis.
- orchiectomy (or-kē-EK-tŏ-mē):
- Excision of the testis.
- orchiepididymitis (or-kē-ĕp-ĭ-dĭd-ĭ-MĪ-tĭs):
- Inflammation of the tested and epididymis.
- orchiopexy (or-kē-ō-PĔK-sē):
- Surgical fixation of the testicle.
- orchioplasty (OR-kē-ō-plăs-tē):
- Surgical repair of the testis.
- orchiotomy (or-kē-ŎT-ō-mē):
- Incision into the testis.
- orchitis (or-KĪ-tĭs):
- Inflammation of the testis.
- organ (OR-găn):
- Anatomically distinct structure of the body composed of two or more tissue types.
- organ system (OR-găn SIS-tĕm):
- Group of organs that work together to perform major functions or meet the physiological needs of the body.
- organelle (OR-gă-nel):
- Tiny functioning units inside of a cell.
- organism (OR-găn-ĭzm):
- Living being that has a cellular structure and can independently perform all physiological functions necessary for life.
- orgasm (OR-gazm):
- A climax of sexual stimulation.
- oropharynx (or-ō-FAR-ingks):
- The oropharynx is a passageway for both air and food and borders the nasopharynx and the oral cavity.
- orthopnea (or-THŎP-nē-ă):
- Breathing is easier in a straight position.
- osmosis (oz-MŌ-sĭs):
- A process by which molecules of a solvent tend to pass through a membrane from a less concentrated solution into a more concentrated one.
- ostectomy (ŏs-TĔK-tō-mē):
- Excision of bone.
- osteoarthritis (ä-stē-ō-är-ˈthrī-təs):
- Inflammation of bone and joint.
- osteoblast (OS-tē-ō-blast):
- Developing bone cell.
- osteochondritis (os-tē-ō-kon-DRĪT-ĭs):
- Inflammation of bone and cartilage.
- osteoclasis (ŏs-tē-ō-KLĀ-sis):
- Surgical breaking of a bone.
- osteocyte (OS-tē-ŏ-sīt):
- Bone cell.
- osteomalacia (os-tē-ō-mă-LĀ-sh-ē-ă):
- Softening of the bones.
- osteomyelitis (os-tē-ō-mī-ĕ-LĪT-ĭs):
- Inflammation of bone and bone marrow.
- osteonecrosis (os-tē-ō-nĕ-KRŌ-sĭs):
- Abnormal condition of bone death (lack of blood supply).
- osteopenia (os-tē-ō-PĒ-nē-ă):
- Abnormal reduction of bone mass.
- osteopetrosis (ŏs-tē-ō-pĕ-TRŌ-sĭs):
- Abnormal condition of stone-like bones.
- osteosarcoma (ŏs-tē-ō-săr-KŌ-mă):
- Malignant tumor of bone.
- otalgia (ō-TĂL-jē-ă):
- Pain in the ear.
- otologist (ō-TŎL-ō-jĭst):
- Specialist who studies and treats disorders and diseases of the ear.
- otology (ō-TŎL-ō-jē):
- Study of the ear.
- otomastoiditis (ō-tō-mas-toyd-ĪT-ĭs):
- Inflammation of the ear and mastoid bone.
- otomycosis (ō-tō-mī-KŌ-sĭs):
- Abnormal condition of fungus in the ear.
- otopyorrhea (ō-tō-pī-ō-RĒ-ă):
- Discharge of pus from the ear.
- otorhinolaryngologist (ō-tō-RĪ-nō-lăr-ĭn-GŎL-ō-jĭst):
- Specialist or physician who studies and treats disease and disorder of the ears, nose and throat.
- otorrhea (ō-tō-RĒ-ă):
- Discharge from the ear.
- otosclerosis (ō-tō-sklē-RŌ-sĭs):
- Hardening of the ear.
- otoscope (Ō-tō-skōp):
- Instrument used to view the ear.
- otoscopy (ō-TŎS-kō-pē):
- Process of viewing the ear.
- ovarian cancer (ō-VAR-ē-ăn KAN-sĕr):
- Malignant tumor of the ovary.
- ovaries (Ō-vă-rēs):
- Two almond shaped organs (female gonads) located at the entrance to the fallopian tubes; responsible for storing of egg cells (ova) and production of estrogen and progesterone hormones.
- ovulation (ov-yŭ-LĀ-shŏn):
- Release of ovum from a mature graafian follicle.
- ovum (ova) (Ō-vŭm):
- Female egg cells.
- oximeter (ok-SIM-ĕt-ĕr):
- Instrument used to mesure oxygen.
- oxytocia (ok-si-TŌ-sia):
- A rapid birth.
Attribution
Except where otherwise noted, this book is adapted from Medical Terminology by Grimm et al. (2022), Nicolet College, CC BY 4.0 International. / A derivative of Building a Medical Terminology Foundation by Carter & Rutherford (2020), and Anatomy and Physiology by Betts, et al., CC BY 4.0, which can be accessed for free at OpenStax Anatomy and Physiology.