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Adj.1.eleven-sided - having eleven sides
many-sided, multilateral - having many parts or sides
References in periodicals archive ?
In turn, each of these "burning stars," as the artist dubs them, featured a metal cover with its own constellation of holes, three-dimensionalized into an undecagon (an eleven-sided form), which also served as an organizational conceit for the show's arcane networks of drawings and contraptions.