Meaning of BAROTROPIC in English
a (theoretical) state in which surfaces of constant pressure and constant temperature coincide at all levels. The atmosphere cannot sustain development, and thickness (q.v.) gradients are zero. If thickness contours are widely spaced (the realistic state), the atmosphere is said to be quasi-barotropic.
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012