Spontaneous mutation
spontaneous mutation n.
A mutation that arises naturally and not as a result of exposure to mutagens. Also called natural mutation.
Read Also:
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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.
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noun 1. (psychol) the reappearance of a response after its extinction has been followed by a period of rest
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- Spontoon
noun 1. a shafted weapon having a pointed blade with crossbar at its base, used by infantry officers in the 17th and 18th centuries. noun 1. a form of halberd carried by some junior infantry officers in the 18th and 19th centuries