quword
趣词
Word Origins Dictionary
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quaternion
"A complex number of the form
w
+
xi
+
yj
+
zk
, where
w
,
x
,
y
,
z
are real numbers and
i
,
j
,
k
are imaginary units that satisfy certain conditions", Mid 19th century: from late Latin
quaternio(n-
), from Latin
quarterni
(see
quaternary
).