Hypertext Webster Gateway: "molehill"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Molehill \Mole"hill`\, n.
A little hillock of earth thrown up by moles working under
ground; hence, a very small hill, or an insignificant
obstacle or difficulty.
Having leapt over such mountains, lie down before a
molehill. --South.
From WordNet (r) 1.7 (wn)
molehill
n : a mound of earth made by moles while burrowing
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