(Greek: equal; by extension: same, similar, alike; normally used as a prefix)
Used in numerous terms, nearly all scientific; denoting: equality, similarity, uniformity, or identity; the second element being properly and usually of Greek origin, rarely of Latin [the proper prefix in the latter case being equi-]. In biology, denoting for or from different individuals of the same species). For a large list of iso- opposites or antonyms, see aniso-.
2. Of, pertaining to, indicating, or corresponding to equal temperatures.
3. Occurring at a constant temperature; pertaining to or involving a constancy of temperature with time.
4. A line connecting points having the same temperature in a vertical section of any part of the sea.
5. A line on a graph showing the relationship between variables, especially pressure and volume, at a constant temperature.
2. A line connecting places on the earth’s surface having the same mean, or constant, temperature.
3. A curve or formula showing the relationship between two variables; such as, pressure and volume, when the temperature is held constant.
2. Of a solution, having the same osmotic pressure as the fluid phase of a cell or tissue.
2. Normal tension under pressure or stimulus.
3. The property of a solution in being isotonic.
2. Isotope literally means, "the same place, an equal place".
3. Elements that occupy the same place in the periodic table of the elements, sharing common chemical properties, but having different atomic weights (depending on the number of neutrons carried by each nucleus).
The decay rates of a number of radioactive isotopes are valuable clocks for archeologists, paleontologists, and geologists.