# abohm

CEFR C2 · Noun

Source: https://englishreference.com/word/abohm
Updated: 2026-05-18

## Definition

a very small unit used to measure electrical resistance. It is one billionth of an ohm and is rarely used today.

For teachers: a unit of electrical resistance equal to one billionth of an ohm. Primarily used in historical or highly specialized contexts.

## Examples

- The resistor had a value of one abohm.
- In early twentieth-century physics, researchers used the abohm to describe the resistance of extremely thin wires.
- While the ohm remains the standard unit for resistance, the abohm was occasionally employed in theoretical calculations involving superconductors or quantum-scale phenomena.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.