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Noun
An
extremely
hard
mineral
,
a
form
of
aluminum oxide
with
the
chemical formula
Al
<
sub
>
2
sub
>
O
<
sub
>
3
sub
>,
that
occurs
in
the
form
of
the
gemstones
sapphire
and
ruby
;
it
is
used
as
an
abrasive
.
Made with ♥ by Homo Sapiens on Planet Earth

Rejected by Y-Combinator. Definitions by Wiktionary.

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