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单词 index-arm
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> as lemmas

index-arm
index-arm n. = sense 2b.
ΘΚΠ
the world > the earth > earth sciences > geography > map-making > surveying > [noun] > surveying instruments > part of a surveying instrument > index arm
index?a1560
index-arm1879
1879 S. Newcomb & E. S. Holden Astron. for Schools & Coll. 92 The index-arm carries the index-glass.
extracted from indexn.
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