Doubleword
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noun.
A unit of computer memory storage, usually four or eight bytes, used in many high-level programming languages.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
An area of
storage
double
the size of the
word
in a particular system; usually eight
bytes
Word Usage
"Non-integer constant doubleword, quadwords, and ten-byte numbers can be loaded via FLD."
suggests
doubled
doubler
doublers