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Hint: Question mark (?) is a wildcard. Question mark substitutes one character.
English
noun
:
rock wool
1.
rock wool
(substance)
a light fibrous material used as an insulator
Synonyms
mineral wool
Broader (hypernym)
dielectric
,
insulator
,
nonconductor
Based on WordNet 3.0 copyright © Princeton University.
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Orcapia v/Per Bang
. English edition:
Peter Jensen
.
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