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plural antiforms
(geology) A topographic feature which is composed of sedimentary layers in a convex formation, but may not actually form a real anticline (i.e., the oldest rocks may not be exposed in the middle).
(art) A form that defies the usual conventions of artistic forms. quotations examples
Dada forms and antiforms were used as a means of reacting against Abstract Expressionism and abstract art generally […]
1983, Edith Kurzweil, William Phillips, Writers and Politics: A Partisan Review Reader, page 236