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synoptiscope
synoptiscope n.
Brit. 
/sᵻˈnɒptᵻskəʊp/
, /sᵻˈnɒptᵻskəʊp/U.S. /səˈnɑptəˌskoʊp/
an optical instrument used for fusion exercises./səˈnɑptəˌskoʊp/ΚΠ
1928 Daily Tel. 28 Sept. The synoptiscope..has what resemble two movable arms in each of which is part of a picture, the two together making the whole picture.
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