isobar [ ahy-suh-bahr ]
1. Meteorology. a line drawn on a weather map or chart that connects points at which the barometric pressure is the same.
2. Also i·so·bare [ahy-suh-bair]. Physics, Chemistry. one of two or more atoms having equal atomic weights but different atomic numbers.
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Origin: 1860–65; < Greek isobarḗs “of equal weight,” from ísos iso- + báros “weight” (see bar)
EXAMPLES FROM THE WEB FOR ISOBAR
In most cases the 29.80-inch isobar furnishes a good limit, out to which the isobars may be traced.
PRACTICAL EXERCISES IN ELEMENTARY METEOROLOGY|ROBERT DECOURCY WARD
Now YOU come up with a sentence (or fic? or graphic?) that best illustrates the word.