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isologue

or i·so·log

[ahy-suh-lawg, -log]
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noun Chemistry.
  1. one of two or more isologous compounds.

Origin of isologue

1885–90; back formation from isologous, on the model of homologue: homologous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018