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• h
  h

  abbreviation

  hard.
• H
  H

  noun

  the eighth letter of the English alphabet, a consonant.
• h.
  h.

  abbreviation

  harbor.
• H.
  H.

  abbreviation

  (in prescriptions) an hour.

h

¹ American  

abbreviation

1. hard.

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h ² American  

Symbol, Physics.

1. Planck's constant.

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H ³ American  

[eych] / eɪtʃ /

Or h

noun

plural

H's, Hs, h's, hs

1. the eighth letter of the English alphabet, a consonant.

2. any spoken sound represented by the letter H or h, as in hot or behave.

3. something having the shape of an H .

4. a written or printed representation of the letter H or h.

5. a device, as a printer's type, for reproducing the letter H or h.

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H ⁴ American  

abbreviation

1. hard.

2. Grammar. head.

3. Electricity. henry.

4. Slang. heroin.

5. high.

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H ⁵ American  

Symbol.

1. the eighth in order or in a series.

2. (sometimes lowercase) the medieval Roman numeral for 200.

3. Chemistry. hydrogen.

4. Biochemistry. histidine.

5. Physics.

   1. enthalpy.

   2. horizontal component of the earth's magnetic field.

   3. magnetic intensity.

6. Music. the letter used in German to indicate the tone B.

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h. ⁶ American  

Or H.

abbreviation

1. harbor.

2. hard.

3. hardness.

4. heavy sea.

5. height.

6. hence.

7. high.

8. Baseball. hit; hits.

9. horns.

10. Also hr. hour; hours.

11. hundred.

12. husband.

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H. ⁷ American  

abbreviation

1. (in prescriptions) an hour.

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H ¹ British  

symbol

1. chem hydrogen

2. physics

   1. magnetic field strength

   2. Hamiltonian

3. electronics henry or henries

4. thermodynamics enthalpy

5. (on Brit pencils, signifying degree of hardness of lead) hard Compare B

   H

   2H

   3H

6. slang heroin

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abbreviation

1. Hungary (international car registration)

h ² British  

/ eɪtʃ /

noun

1. the eighth letter and sixth consonant of the modern English alphabet

2. a speech sound represented by this letter, in English usually a voiceless glottal fricative, as in hat

3. 1. something shaped like an H

   2. ( in combination )

      an H-beam

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h. ³ British  

abbreviation

1. harbour

2. height

3. hour

4. husband

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h ⁴ British  

symbol

1. physics Planck constant

2. hecto-

3. chess See algebraic notation

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Etymology

Origin of H.

From the Latin word hōra

Example Sentences

The potential $48.8 billion valuation would be more than double Cerebras’s latest $23 billion valuation following a $1 billion Series H funding round in February.

From MarketWatch • May 13, 2026

A key foundation for understanding why time seems to move in one direction is Boltzmann's H theorem, a central principle in statistical mechanics tied to the second law of thermodynamics.

From Science Daily • May 3, 2026

And some cities feel they never got their fair share of funds from Measure H, the homelessness services tax measure passed in 2017.

From Los Angeles Times • May 1, 2026

Citi maintains its buy rating, with target prices of 123.00 yuan for A shares and HK$134.00 for H shares.

From The Wall Street Journal • Apr. 24, 2026

H: Okay, because you don’t want to ruin things with Lewis.

From "From Twinkle, with Love" by Sandhya Menon

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