From WordNet (r) 3.0 (2006) [wn]:
dale
n 1: an open river valley (in a hilly area)
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Dale \Dale\ (d[=a]l), n. [AS. d[ae]l; akin to LG., D., Sw.,
Dan., OS., & Goth. dal, Icel. dalr, OHG. tal, G. thal, and
perh. to Gr. qo`los a rotunda, Skr. dh[=a]ra depth. Cf.
Dell.]
1. A low place between hills; a vale or valley.
[1913 Webster]
Where mountaines rise, umbrageous dales descend.
--Thomson.
[1913 Webster]
2. A trough or spout to carry off water, as from a pump.
--Knight.
[1913 Webster]