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nonstoichiometric

British  
/ nɒnˌstɔɪkɪəˈmɛtrɪk /

adjective

  1. chem (of a solid compound) having a composition in which the ratio of the atoms present is not a simple integer

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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“The Dance of the Solids,” with its rhyming references to ceramics, polymers and nonstoichiometric crystals, also appeared in Updike’s collection Midpoint and Other Poems.

From Scientific American