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cross-hair (n.)
[cross-hair 词源字典]
also
crosshair
,
cross-hairs
, 1755, of a telescope, 1780 in gunnery, from
cross-
+
hair
(n.). Also often in early 19c.
spider-line
,
spider's-line
(1819).
[cross-hair etymology, cross-hair origin, 英语词源]
[cross-hair 词源字典]