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The Collaborative International Dictionary of English v.0.48:

Isologous \I*sol"o*gous\, a. [Iso- + Gr. lo`gos proportion.] (Chem.) Having similar proportions, similar relations, or similar differences of composition; -- said specifically of groups or series which differ by a constant difference; as, ethane, ethylene, and acetylene, or their analogous compounds, form an isologous series. [1913 Webster]