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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 $56.4 billion valuation is more than double Cerebras’s most recent $23 billion valuation following a $1 billion Series H funding round in February.

From MarketWatch • May 13, 2026

However, the H theorem itself is time-symmetric, meaning it does not prefer one direction of time over another.

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

Between its Series G round at the end of September and the most recent Series H round in February, its post-money valuation grew from $8.1 billion to $23 billion, according to company documents.

From The Wall Street Journal • Apr. 27, 2026

He showed up at Room H moments later, wearing a respirator, to find out what was going on.

From "The Hot Zone" by Richard Preston

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