1) a line on a map joining places with the same atmospheric pressure at a particular time (isobar)
2) the layer of atmospheric air between about 10 and 60 km above the earth's surface (stratosphere)
3) a kind of long, open box used for animals to feed or drink from; a region of lower atmospheric pressure between two regions of higher pressure (trough)
(also called antenna) a part of a radio or TV system which receives or sends out signal
occurring in the air
having plenty of fresh air moving through it
open to the atmosphere
light in weight
not heavy
outdoors
airy
worked or driven by compressed air; filled with compressed air
airy
having no weight (e.g. as in space)
light
