| Isthmus (n.) A neck or narrow slip of land by which two continents are connected, or by which a peninsula is united to the mainland; as, the Isthmus of Panama; the Isthmus of Suez, etc. Thesaurus Entries abbreviation, astriction, astringency, bottleneck, canal, cervix, channel, circumscription, coarctation, compactedness, compaction, compression, compressure, concentration, condensation, consolidation, constriction, constringency, contraction, contracture, curtailment, decrease, defile, diminuendo, hourglass, hourglass figure, knitting, narrow, narrow place, narrowing, narrows, neck, pass, puckering, pursing, reduction, shortening, solidification, strait, stranglement, strangulation, striction, stricture, systole, throat, wasp waist, wrinkling |