Definition of Portland cement
Port´land ce`ment´
1.
A
cement
having
the
color
of
the
Portland
stone
of
England
,
made
by
calcining
an
artificial
mixture
of
carbonate
of
lime
and
clay
,
or
sometimes
certain
natural
limestones
or
chalky
clays
.
It
contains
a
large
proportion
of
clay
,
and
hardens
under
water
.
Related Words
cement
,
hydraulic
cement
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