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An ohmic device is one that demonstrates the Ohm's Law for the relationship of current through it and voltage across. According to Ohm's law where V is the voltage, I is the current and R is a constant called the resistance.
No actual device can demonstrate ideal resistance described by Ohm's law but many devices approximate ohmic devices closely. Examples of ohmic devices include resistors and pieces of wire. A light bulb is an example of a non-Ohmic device because the current flow heats the bulb, and its resistance depends on temperature.
In semiconductor devices highly doped regions (referred to as ohmic contacts) approximate ohmic responses even though moderately doped regions are strongly dependent on voltage.
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