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marker
noun
a
pen
with
a
thick
,
usually
felt
tip
that
makes
bold
lines
in
bright
or
dark
ink
•
Jake
used
a
marker
to
draw
a
huge
red
heart
on
his
science-fair
poster
.
Jake
used
a
marker
to
draw
a
huge
red
heart
on
his
science-fair
poster
.
•
Please
write
your
name
on
the
name
tag
with
a
black
marker
.
Please
write
your
name
on
the
name
tag
with
a
black
marker
.
From
‘
mark
’
+
‘
-er
’,
meaning
something
that
makes
a
mark
.
noun
an
object
,
sign
,
or
line
that
shows
a
position
,
limit
,
or
measurement
•
A
wooden
marker
showed
hikers
where
the
trail
turned
left
.
A
wooden
marker
showed
hikers
where
the
trail
turned
left
.
•
We
placed
a
small
stone
marker
at
the
spot
where
we
buried
the
time
capsule
.
We
placed
a
small
stone
marker
at
the
spot
where
we
buried
the
time
capsule
.
From
‘
mark
’
meaning
a
sign
or
boundary
,
plus
the
agent
suffix
‘
-er
’.
noun
a
specific
gene
or
DNA
sequence
used
to
identify
a
trait
,
disease
,
or
individual
in
genetics
and
medicine
•
The
scientist
searched
for
a
genetic
marker
linked
to
the
inherited
illness
.
The
scientist
searched
for
a
genetic
marker
linked
to
the
inherited
illness
.
•
Blood
tests
can
detect
tumor
markers
that
help
doctors
monitor
cancer
treatment
.
Blood
tests
can
detect
tumor
markers
that
help
doctors
monitor
cancer
treatment
.
Adopted
in
the
mid-20th
century
as
genetics
advanced
,
extending
the
general
sense
of
‘
marker
’
to
specific
biological
signs
.
noun
in
sports
,
a
player
whose
job
is
to
stay
close
to
an
opposing
player
to
stop
them
from
receiving
the
ball
•
The
coach
assigned
our
fastest
defender
as
the
marker
for
their
star
striker
.
The
coach
assigned
our
fastest
defender
as
the
marker
for
their
star
striker
.
•
If
you
lose
your
marker
,
switch
to
a
zonal
defense
.
If
you
lose
your
marker
,
switch
to
a
zonal
defense
.
Extension
of
‘
marker
’
meaning
something
that
marks
:
the
player
‘
marks
’
an
opponent
by
staying
close
.
