isothere

[Pref. iso- =equal, and Gr. theros =summer.] Physic. Geog. & Meteor.: An isotheral line (q.v.). I-so-therm, s. [Pref. iso-, and Greek therme = heat.] Physic. Geog. & Meteor.: An isothermal line. i-so-thermal, a. [Pref. iso- =equal, and thermē =heat.] Physic. Geog. & Meteor.: Of or belonging to zones or divisions of the land, ocean, or atmosphere, which have an equal degree of mean annual warmth. (Lyell.) IMG:content-0077.png:[blocks in formation] -ism.]