straining-framen. a frame on which paper, canvas, etc. is stretched.
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straining-frame1763
1763 H. WalpoleVertue's Anecd. Painting III. i. 45 On the straining frame was writ Gerard Soest pinxit.
1815 J. SmithPanorama Sci. & Art II. 747 The paper designed for a transparency must be fixed on a straining frame, such as that of a drawing board without its pannel.