Dictionary

open reading frame A portion of DNA that occurs between a start codon and a termination codon which can potentially be translated into a protein Abbreviated ORF.

open fracture See fracture, compound.

oophoritis Inflammation of the ovary, or egg sac.

oophorectomy The removal of one or both ovaries by surgery.

oogonium An ancestral cell that gives rise to an oocyte.

oocyte donation The use of donor female gametes (oocytes) during assisted reproductive technologies such as in-vitro fertilization (IVF) in the treatment of infertility. Also known as egg donation. See also IVF; oocyte.

oocyte A female germ cell in the process of development. The oocyte is produced in the ovary by an ancestral cell called an oogonium and gives rise to the ovum (the egg), which can be fertilized.

oo- Prefix meaning egg or egg-related, as in oocyte (a female germ cell—an egg—in the process of development) and oophoritis (inflammation of the egg sac).

onychoosteodysplasia See nail-patella syndrome.

onychomycosis Fungus infection of the nail bed under the fingernails or toenails. Onychomycosis makes the nails look white and opaque, thickened, and brittle. It usually produces no symptoms other than a cosmetic problem. Treatment includes avoiding artificial nails, using safer application techniques and only new artificial nails, and using topical and oral antifungal medications. Also…

onycholysis Loosening of a nail from the nail bed, usually starting at the border of the nail. The nail tends to turn whitish or yellowish, reflecting the presence of air under it. The treatment is to trim the nail short, not to clean under the nail, and to be patient.

onychodystrophy Malformation of the nails.