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microinch
[
mahy
-kroh-inch]
WORD ORIGIN
noun
a unit of length equal to one millionth of an
inch
.
Symbol
: μin
Origin of
microinch
First recorded in
1940–45;
micro-
+
inch
1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019