Index of English words, starting with "is"

(1) - Isologous (a.) 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.

(1) - Isomer (n.) A body or compound which is isomeric with another body or compound; a member of an isomeric series.