| vernal pools | <ecology> Perched wetlands which are seasonally to semi-permanently flooded depressions typically occurring on sites with poor drainage. (09 Oct 1997) |
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| insurance pools | An organization of insurers or reinsurers through which particular types of risk are shared or pooled. The risk of high loss by a particular insurance company is transferred to the group as a whole (the insurance pool) with premiums, losses, and expenses shared in agreed amounts. (12 Dec 1998) |