pincushioning
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pincushioning — noun In graphic arts, the effect whereby an image bows in at the sides; the opposite of barrel distortion … Wiktionary
Indian Head test card — The Indian Head Test Card was a black and white television test pattern which was introduced in 1939 by RCA of Harrison, New Jersey as a part of the RCA TK 1 Monoscope. 20th century television later became so important socially that this purely… … Wikipedia
pincushion deformity — a complication of a transposition flap in which the graft fails to adhere to the underlying bed and bulges out to leave a pocket underneath. Called also pincushioning and trapdoor d … Medical dictionary
