A unit of electrical conductance equal to 10^-9 siemens (formerly called an abmho), used in older electrical engineering texts.
From ab- (a prefix meaning 10^-9 in CGS units) plus mho (the reciprocal of ohm, the unit of resistance, spelled 'ohm' backwards). This terminology emerged in early 20th-century electrical engineering.
Absmho is a relic of the CGS unit system that physicists loved but was terrible for doing actual calculations—it's why we switched to SI units, but the word survives in old electrical engineering textbooks like a ghost of outdated standards.
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