noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   An alloy with high magnetic permeability, consisting of nickel (77%) and iron (15%) with traces of copper and molybdenum. uncountable

Etymology

From mu + metal; the Greek letter mu (μ) is a symbol for permeability.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.