2 (also pincushion distortion) [mass noun] a form of optical distortion in which straight lines along the edge of a screen or a lens bulge towards the centre.
3 (also pincushion protea)South African an African shrub or tree related to the proteas, with rounded flower heads that resemble pincushions.
Genus Leucospermum, family Proteaceae
pincushion in other Oxford dictionaries
Definition of pincushion in the US English dictionary
