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lab
noun
a
room
or
building
with
special
equipment
where
scientists
,
engineers
,
or
medical
workers
carry
out
tests
,
research
,
or
experiments
•
Mia
carefully
measured
the
solution
before
placing
it
in
the
lab
oven
.
Mia
carefully
measured
the
solution
before
placing
it
in
the
lab
oven
.
•
The
new
microscope
arrived
,
and
the
whole
lab
gathered
to
try
it
out
.
The
new
microscope
arrived
,
and
the
whole
lab
gathered
to
try
it
out
.
Shortened
form
of
“
laboratory
,”
first
recorded
in
the
late
1800s
.
noun
a
class
period
at
school
or
university
in
which
students
perform
practical
experiments
,
usually
held
in
a
laboratory
•
We
have
biology
lab
on
Wednesday
afternoon
.
We
have
biology
lab
on
Wednesday
afternoon
.
•
During
chemistry
lab
,
we
learned
how
to
titrate
acids
and
bases
.
During
chemistry
lab
,
we
learned
how
to
titrate
acids
and
bases
.
From
“
laboratory
”
in
the
sense
of
a
practical
science
class
;
popularized
in
U
.
S
.
universities
in
the
early
20th
century
.
noun
informal
short
form
of
“
Labrador
Retriever
,”
a
large
,
friendly
dog
bred
to
retrieve
game
,
now
a
popular
family
pet
and
service
dog
•
The
black
lab
wagged
her
tail
and
greeted
everyone
at
the
door
.
The
black
lab
wagged
her
tail
and
greeted
everyone
at
the
door
.
•
Sam
takes
his
lab
to
the
park
every
morning
for
a
long
run
.
Sam
takes
his
lab
to
the
park
every
morning
for
a
long
run
.
Clipped
form
of
“
Labrador
Retriever
,”
first
attested
mid-20th
century
in
North
America
.