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crystal
noun
a
solid
substance
or
piece
of
mineral
whose
atoms
are
arranged
in
a
repeating
pattern
,
often
forming
flat
,
shiny
faces
•
A
snowflake
is
a
tiny
crystal
of
ice
with
six
delicate
arms
.
A
snowflake
is
a
tiny
crystal
of
ice
with
six
delicate
arms
.
•
He
found
a
purple
amethyst
crystal
while
hiking
in
the
mountains
.
He
found
a
purple
amethyst
crystal
while
hiking
in
the
mountains
.
From
Old
French
cristal
,
from
Latin
crystallum
,
from
Ancient
Greek
krustallos
“
ice
,
rock
crystal
”.
noun
very
clear
,
high-quality
glass
,
and
the
objects
made
from
it
•
The
table
was
set
with
sparkling
crystal
.
The
table
was
set
with
sparkling
crystal
.
•
She
wrapped
the
fragile
crystal
vase
in
cloth
before
packing
.
She
wrapped
the
fragile
crystal
vase
in
cloth
before
packing
.
noun
the
clear
,
protective
cover
over
the
face
of
a
watch
or
clock
•
The
watch
crystal
shattered
when
it
hit
the
concrete
.
The
watch
crystal
shattered
when
it
hit
the
concrete
.
•
He
polished
the
sapphire
crystal
to
remove
smudges
.
He
polished
the
sapphire
crystal
to
remove
smudges
.
noun
a
thin
piece
of
quartz
that
vibrates
at
a
precise
frequency
to
control
an
electronic
circuit
or
keep
time
•
The
technician
soldered
a
new
quartz
crystal
onto
the
circuit
board
.
The
technician
soldered
a
new
quartz
crystal
onto
the
circuit
board
.
•
Without
its
timing
crystal
,
the
microcontroller
cannot
keep
accurate
time
.
Without
its
timing
crystal
,
the
microcontroller
cannot
keep
accurate
time
.
