| ISOPHONES | • isophones n. Plural of isophone. • ISOPHONE n. a line delineating a geographical region where a certain pronunciation is used. |
| ISOPHOTAL | • isophotal adj. Of or pertaining to isophotes. • ISOPHOTAL adj. relating to an isophote, a line connecting points of equal light intensity from a given source. |
| ISOPHOTES | • isophotes n. Plural of isophote. • ISOPHOTE n. a line on an image of a galaxy, nebula or other celestial object connecting points of equal light intensity from a given source. |
| ISOPLETHS | • isopleths n. Plural of isopleth. • ISOPLETH n. a line connecting points of equal aspect of climate. |
| ISOPODANS | • isopodans n. Plural of isopodan. • ISOPODAN n. a kind of crustacean, also ISOPOD. |
| ISOPODOUS | • isopodous adj. Belonging or relating to the isopods. • ISOPODOUS adj. of or like an isopod, a kind of small crustacean. |
| ISOPOLITY | • isopolity n. Equal rights of citizenship in different communities; mutual political rights. • ISOPOLITY n. reciprocity of rights of citizenship in two communities. |
| ISOPRENES | • isoprenes n. Plural of isoprene. • ISOPRENE n. a hydrocarbon of the terpene group. |
| ISOPROPYL | • isopropyl n. (Chemistry) the univalent organic radical (CH3)2CH-. • ISOPROPYL n. a radical derived from propane. |
| ISOPTERAN | • isopteran n. (Zoology) Any member of the infraorder Isoptera of termites. • ISOPTERAN n. any member of an order of insects, the termites, having the two pairs of wings (when present) closely alike. |
| ISOPYCNAL | • isopycnal n. (Meteorology, oceanography) A line connecting points of constant density in the ocean or in the atmosphere. • ISOPYCNAL n. a line on a map connecting points of equal atmospheric density, also ISOPYCNIC. |
| ISOPYCNIC | • isopycnic adj. (Physics) Of points on a surface, or in a medium: having equal densities. • isopycnic n. A line on a chart connecting points of equal density. • ISOPYCNIC n. a line on a map connecting points of equal atmospheric density, also ISOPYCNAL. |