Ohm

biographical name

ˈōm How to pronounce Ohm (audio)
Georg Simon 1787–1854 German physicist

Browse Nearby Words

Ohlone
ohm
Ohm
See all Nearby Words

Cite this Entry

“Ohm.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Ohm. Accessed 10 Jun. 2026.

Copy Citation

Kids Definition

ohm

noun
ˈōm How to pronounce ohm (audio)
: a unit of electric resistance equal to the resistance of a circuit in which a potential difference of one volt produces a current of one ampere
ohmic
ˈō-mik How to pronounce ohm (audio)
adjective

Medical Definition

ohm

noun
ˈōm How to pronounce ohm (audio)
: the practical mks unit of electrical resistance equal to the resistance of a circuit in which a potential difference of one volt produces a current of one ampere
ohmic
ˈō-mik How to pronounce ohm (audio)
adjective
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster

Word of the Day

Listen to the pronunciation of foible

See Definitions and Examples »

Popular in Grammar & Usage

See More

Every Letter Is Silent, Sometimes: A-Z List of Examples

5 Verbal Slip Ups and Language Mistakes

Regarding the Incorrect Use of 'Decimate'

Is that lie 'bald-faced' or 'bold-faced'?

The Difference Between 'i.e.' and 'e.g.'
See More

Popular in Wordplay

See More

What to Call the Inept, Incompetent, and Inferior

Strange Words for Body Functions

Where does 'curiosity killed the cat' come from?

Cattywampus, Taradiddle, and More Funny-Sounding Words

Is “GIF” Pronounced “Jiff” or “Giff”?
See More

Popular

See More

Every Letter Is Silent, Sometimes: A-Z List of Examples

What to Call the Inept, Incompetent, and Inferior

Strange Words for Body Functions
See More

Games & Quizzes

See All
Play Quordle: Guess all four words in a limited number of tries. Each of your guesses must be a real 5-letter word.
Quordle Can you solve 4 words at once?
Play Blossom: Solve today's spelling word game by finding as many words as you can using just 7 letters. Longer words score more points.
Blossom Pick the best words!
Play Missing Letter: a crossword with a twist. Each of the 25 puzzle words start with a different letter of the alphabet. Which letter is missing?
The Missing Letter A daily crossword with a twist
a cup of tea and a golf ball on tee side by side
Sounds Like... Quiz June 2026 Choose the word that sounds like it fits the clue...
See All