There are 3 definitions of h in English:

h1

Syllabification: h
Pronunciation: /āCH
 
/

abbreviation

1(In measuring the height of horses) hand(s).
1.1 [in combination] (In units of measurement) hecto-: wine production reached 624,000 hl last year
1.2Horse.
1.3(Especially with reference to water) hot: nine rooms, all with h & c
1.4Hour(s): breakfast at 0700 h

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Physics Planck’s constant.

Definition of h in:

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Word of the day anomalous
Pronunciation: əˈnämələs
adjective
deviating from what is standard, normal, or expected

There are 3 definitions of h in English:

H2

Syllabification: H
Pronunciation: /āCH
 
/
(also h)

noun (plural Hs or H's /ˈāCHiz/)

1The eighth letter of the alphabet.
1.1Denoting the next after G in a set of items, categories, etc.
1.2 (h) Chess Denoting the file on the right-hand edge of the board, as viewed from White’s side.
2 (H) A shape like that of a capital H.
3 (H) Music (In the German system) the note B natural.

Definition of h in:

There are 3 definitions of h in English:

H3

Syllabification: H
Pronunciation: /
 
āCH/

abbreviation

1Hard (used in describing grades of pencil lead): a 2H pencil
1.1Height (in giving the dimensions of an object).
1.2 Physics Henry(s).
1.3 informal Heroin.

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1 Chemistry Enthalpy.
1.1The chemical element hydrogen.
1.2 Physics Magnetic field strength.

Definition of h in: