spontaneous mutation n.
A mutation that arises naturally and not as a result of exposure to mutagens. Also called natural mutation.
adjective 1. coming or resulting from a natural impulse or tendency; without effort or premeditation; natural and unconstrained; unplanned: a spontaneous burst of applause. 2. (of a person) given to acting upon sudden impulses. 3. (of natural phenomena) arising from internal forces or causes; independent of external agencies; self-acting. 4. growing naturally or without cultivation, […]
- Spontaneous pneumothorax
spontaneous pneumothorax n. A pneumothorax occurring secondary to parenchymal lung disease.
- Spontaneous recovery
noun 1. (psychol) the reappearance of a response after its extinction has been followed by a period of rest
- Spontaneous version
spontaneous version n. A turning of the fetus occurring as a result of the unaided contraction of the uterine muscle.