Primary amenorrhea
primary amenorrhea n.
Amenorrhea in which menstruation has never occurred.
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- Primary amyloidosis
primary amyloidosis n. A rare form of amyloidosis that is sometimes hereditary and is characterized by amyloid deposits in the heart, tongue, gastrointestinal tract, and skeletal muscle.
- Primary anesthetic
primary anesthetic n. The compound that contributes most to loss of sensation when a mixture of anesthetics is administered.
- Primary atelectasis
primary atelectasis n. Failure of the lungs to expand after birth, as in stillborn infants or in liveborn infants who die before respiration is established. Also called anectasis.
- Primary atypical pneumonia
primary atypical pneumonia n. An acute systemic disease with involvement of the lungs, caused by Mycoplasma pneumoniae and marked by high fever and cough. Also called atypical pneumonia, mycoplasmal pneumonia.
- Primary-beam
noun, Physics. 1. See under secondary beam. secondary beam noun, Physics. 1. a beam of particles of one kind selected from the group of particles produced when a beam of particles from an accelerator (primary beam) strikes a target.