O Terms

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Object permanence
The idea that objects continue to exist even when they are no longer in view. Coined by Swiss psychologist Jean Piaget in 1954, object ... Read More
Obstetrician-Gynecologist (OB-GYN)
A specialist in the medical and surgical problems associated with women's reproductive system. These doctors receive at least four years of ... Read More
Occupational Therapist
Person with special training in infant development who works in the nursery or a follow-up clinic. An occupational therapist is trained in ... Read More
OFC or Occipitofrontal Circumference
A measure of head size. This commonly obtained measure of head size is used to monitor normal growth and to identify problems with the brain. ... Read More
Oligohydramnios
Below normal amount of amniotic fluid. Amniotic fluid provides a cushion to the fetus against physical trauma and also permits the fetus to ... Read More
Oligomenorrhea
Infrequent or irregular menstrual cycles. Normal menstrual cycles will often vary and this is not necessarily a sign of infertility. This ... Read More
Oligospermia
A low sperm count in seminal fluid.
Omega-3 Essential Fatty Acids
Omega-3s are a class of fatty acids found in fish oils (particularly salmon and other cold-water fish). These acids lower the levels of ... Read More
Omphalocele
A type of congenital condition in which the contents of the abdomen protrude through a defect in the abdominal wall. Surgery is required to ... Read More
Oocyte
An immature ovum, or egg. A "primary oocyte" has not yet completed its first maturation division. A "secondary oocyte" has completed its ... Read More
Oral Gastric Tube (OG Tube)
Small, flexible tube inserted through the nose or mouth, down the esophagus, and into the stomach. It is used to drain the stomach or feed the ... Read More
Oral Glucose Tolerance Test (OGTT)
An oral glucose tolerance test (OGTT) measures your body's ability to utilize glucose (a type of sugar and your body's main source of energy). ... Read More
Organic
Organic crops are raised without using most conventional pesticides, petroleum-based fertilizers, or sewage sludge-based fertilizers. ... Read More
Organic food
Organic food is produced by farmers who emphasize the use of renewable resources and the conservation of soil and water to enhance ... Read More
Ovarian Cyst
An ovarian cyst is a fluid-filled sac in the ovary. The most common type of ovarian cyst is a follicular cyst. This results from the growth of a ... Read More
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