Etymology

abohm

ab·ohm
A1B3O1H4M3

Today it means: A unit of electrical resistance equal to one billionth of an ohm (10⁻⁹ ohms), used in the centimeter-gram-second system of units. Full definition →

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The story

From ab- (“absolute”) + ohm.

Etymology from Wiktionary, CC BY-SA 4.0.