| watershed | 1. The whole region or extent of country which contributes to the supply of a river or lake. 2. The line of division between two adjacent rivers or lakes with respect to the flow of water by natural channels into them; the natural boundary of a basin. Origin: Cf. G. Wasserscheide; wasser water + scheide a place where two things separate, fr. Scheiden to separate. Source: Websters Dictionary (01 Mar 1998) |
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| watershed infarction | Cortical infarction in an area where the distribution of major cerebral arteries meet or overlap. (05 Mar 2000) |