- Meteo.: A line connecting points having equal pressure.
- Any of a group of nuclides which, although having
different atomic numbers, have identical mass numbers; e.g. the tin
isotope 11550Sn and
the indium isotope 11549In.
See also: From Gk. isobares “of equal weight,” from → iso- +
bar, from baros “weight,” cognate with Pers.
bâr “charge, weight” (Mid.Pers. bâr,
from O.Pers./Av. bar- “to bear, carry,”
Mod.Pers. bordan “to carry;”
L. brutus “heavy, dull, stupid, brutish;”
Skt. bhara- “burden, load,” bharati “he carries;”
Mod.Pers. gerân “heavy;”
Skt. guru; L. gravis;
PIE *gwere- “heavy;” *bher- “to carry, give birth”).
