adjective sub·i·ta·ne·ous \¦səbə¦tānēəs\

Definition of subitaneous

  1. :  formed or taking place suddenly or unexpectedly :  sudden, hasty; especially :  undergoing or ready for immediate development subitaneous summer eggs that develop without a period of dormancy

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Origin and Etymology of subitaneous

Latin subitaneus — more at sudden

Seen and Heard

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a rounded knoll or a ridge of ice

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