past participle of overlie.
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verb (used with object), overlay, overlain, overlying.
to lie over or upon, as a covering or stratum.
to smother (an infant) by lying upon it, as in sleep.

1125–75; Middle English overlien, overliggen. See over-, lie2

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World English Dictionary
overlie (ˌəʊvəˈlaɪ)
vb , -lies, -lying, -lay, -lain
1.  Compare overlay to lie or rest upon
2.  to kill (a baby or newborn animal) by lying upon it

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Ancient folded rocks eroded and overlain by tilted younger rocks.
Where overlain by loess, this unit has a red dotted overlay pattern on the source map.
On the south side, it is overlain by beach gravel and in places shoreline carbonate oolitic sands.
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