From The Collaborative International Dictionary of English v.0.48 [gcide]:
Dell \Dell\, n. [AS. del, akin to E. dale; cf. D. delle, del,
low ground. See Dale.]
1. A small, retired valley; a ravine.
[1913 Webster]
In dells and dales, concealed from human sight.
--Tickell.
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2. A young woman; a wench. [Obs.]
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Sweet doxies and dells. --B. Jonson.
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From WordNet (r) 3.0 (2006) [wn]:
dell
n 1: a small wooded hollow [syn: dell, dingle]