Isobar

[Sarah]

A line connecting or marking places upon the surface of theearth where height of the barometer reduced to sea level is the sameeither at a given time, or for a certain period (mean height), as fora year; an isopiestic line. [Written also isobare.]

[Sarah]

The Collective term for a Group of Emos.

Because they are linked by their depression.

[Dianne]

a line drawn on a weather map joining all the places that have the same air pressure

[exinilu]

A line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period.