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limestone
noun
-
limestone
,
limestoning
,
limestones
,
limestoned
A
sedimentary
rock
formed
mainly
from
the
shells
and
skeletons
of
tiny
sea
creatures
,
consisting
mostly
of
calcium
carbonate
.
•
The
Great
Pyramid
is
made
of
huge
limestone
blocks
.
The
Great
Pyramid
is
made
of
huge
limestone
blocks
.
•
Limestone
is
crushed
to
make
cement
for
construction
.
Limestone
is
crushed
to
make
cement
for
construction
.
From
Middle English
*limeston*
,
a
compound
of
lime
+
stone
.
The
term
dates
back
to
the
14th
century
.