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mho

[moh] /moʊ/
noun, plural mhos. Electricity
1.
See under siemens.
Also called reciprocal ohm.

siemens

[see-muh nz] /ˈsi mənz/
noun, (used with a singular verb)
1.
Electricity. the standard unit of electrical conductance in the International System of Units (SI), equal to the reciprocal of the ohm and replacing the equivalent MKS unit (mho)
Abbreviation: S.
Origin
1930-1935
1930-35; named after Sir W. Siemens
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for mhos

mho

/məʊ/
noun (pl) mhos
1.
the former name for siemens
Word Origin
C19: formed by reversing the letters of ohm (first used by Lord Kelvin)

siemens

/ˈsiːmənz/
noun (pl) siemens
1.
the derived SI unit of electrical conductance equal to 1 reciprocal ohm S Formerly called mho

Siemens

/ˈsiːmənz/
noun
1.
Ernst Werner von (ɛrnst ˈvɛrnər fɔn). 1816–92, German engineer, inventor, and pioneer in telegraphy. Among his inventions are the self-excited dynamo and an electrolytic refining process
2.
his brother, Sir William, original name Karl Wilhelm Siemens. 1823–83, British engineer, born in Germany, who invented the open-hearth process for making steel
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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mhos in Medicine

mho (mō)
n. pl. mhos
A siemens.

siemens sie·mens (sē'mənz)
n. pl. siemens
A unit of electrical conductance in the International System of Units, equal to one ampere per volt.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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mhos in Science
mho
  (mō)   
The SI derived unit of electrical conductance, equal to one ampere per volt. It is equivalent to the reciprocal of the ohm unit. Also called siemens.
siemens
  (sē'mənz)   
Plural siemens
See mho.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for mhos

siemens

unit of electrical conductance. In the case of direct current (DC), the conductance in siemens is the reciprocal of the resistance in ohms (S = amperes per volts); in the case of alternating current (AC), it is the reciprocal of the impedance in ohms. A former term for the reciprocal of the ohm is the mho (ohm spelled backward). It is disputed whether the siemens was named after the German-born engineer-inventor Sir William Siemens (1823-83) or his brother, the electrical engineer Werner von Siemens (1816-92).

Learn more about siemens with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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