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3 definitions found
From:
Webster's Revised Unabridged Dictionary (1913)
Coun·ter·bore
v. t.
To
form
a
counterbore
in
,
by
boring
,
turning
,
or
drilling
;
to
enlarge
,
as
a
hole
,
by
means
of
a
counterbore
.
◄
►
From:
Webster's Revised Unabridged Dictionary (1913)
Coun·ter·bore
n.
1.
A
flat-bottomed
cylindrical
enlargement
of
the
mouth
of
a
hole
,
usually
of
slight
depth
,
as
for
receiving
a
cylindrical
screw
head
.
2.
A
kind
of
pin
drill
with
the
cutting
edge
or
edges
normal
to
the
axis
; --
used
for
enlarging
a
hole
,
or
for
forming
a
flat-bottomed
recess
at
its
mouth
.
From:
WordNet (r) 2.0
counterbore
n
:
a
bit
for
enlarging
the
upper
part
of
a
hole
[
syn
:
countersink
,
countersink bit
]
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