sill
English Dictionary
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sill Definition
(n)
structural
member
consisting
of
a
continuous
horizontal
timber
forming
the
lowest
member
of
a
framework
or
supporting
structure
(n) (
geology
)
a
flat
(
usually
horizontal
)
mass
of
igneous
rock
between
two
layers
of
older
sedimentary
rock
sill Synonyms
sill
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