> as lemmas
drop-shutter
drop-shutter n.
Brit. 
/ˈdrɒpˌʃʌtə/
, /ˈdrɒpˌʃʌtə/U.S. /ˈdrɑpˌʃədər/
a device for securing very brief exposure in instantaneous photography; see quot./ˈdrɑpˌʃədər/ΚΠ
1890 W. de W. Abney Treat. Photogr. (ed. 6) 235 The principle of a drop~shutter is the passing of an elongated aperture, cut in a board, over the front of the lens.
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