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biological
adjective
connected
with
living
things
and
how
they
work
•
In
science
class
,
we
studied
the
biological
functions
of
the
human
heart
.
In
science
class
,
we
studied
the
biological
functions
of
the
human
heart
.
•
Scientists
discovered
a
new
biological
pathway
that
controls
sleep
.
Scientists
discovered
a
new
biological
pathway
that
controls
sleep
.
From
biology
+
-ical
,
first
recorded
in
the
early
19th
century
.
adjective
related
by
blood
rather
than
by
adoption
or
marriage
•
After
years
of
searching
,
she
finally
met
her
biological
mother
.
After
years
of
searching
,
she
finally
met
her
biological
mother
.
•
He
has
two
sisters
,
one
adopted
and
one
biological
.
He
has
two
sisters
,
one
adopted
and
one
biological
.
Extension
of
the
scientific
sense
to
blood
relations
in
the
mid-20th
century
.
noun
a
person
’
s
biological
parent
•
At
the
reunion
,
he
was
nervous
about
meeting
his
biological
for
the
first
time
.
At
the
reunion
,
he
was
nervous
about
meeting
his
biological
for
the
first
time
.
•
The
adoptee
wrote
a
letter
to
her
biological
asking
for
a
meeting
.
The
adoptee
wrote
a
letter
to
her
biological
asking
for
a
meeting
.
Noun
use
developed
from
the
adjective
in
late
20th-century
North
American
adoption
communities
.