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Beginning
1
English
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1.1
Noun
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engineer's blue
1 language
Malagasy
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From Wiktionary, the free dictionary
English
[
edit
]
English
Wikipedia
has an article on:
engineer's blue
Wikipedia
Noun
[
edit
]
engineer
's
blue
(
uncountable
)
A blue
paste
made from
Prussian blue
and some
oily
substance, used to verify the
mating
of
components
by rubbing a coated
workpiece
against the target
surface
to leave marks.
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