H+

H¹ or h «aych», noun, plural H's or Hs, h's or hs.

1. the eighth letter of the English alphabet. »

There are two h's in high.

2. any sound represented by this letter.

3. (used as a symbol for) the eighth (of an actual or possible series): »

row H in a theater.

4. Slang. heroin.

Usage A nonstandard pronunciation «haych» sometimes occurs.

H² «aych», noun, plural H's.

anything shaped like a capital H: »

I had a wound here that was like a T, But now 'tis like an H (Shakespeare).

h (no period),

an abbreviation or symbol for the following:

1. henry (unit of electrical inductance).

2. hydrocortisone.

3. Planck's constant.

h.,

an abbreviation for the following:

1. Mineralogy. a) hard. b) hardness.

2. Physics, Chemistry. head (unit of pressure).

3. height.

4. heir.

5. heller¹.

6. high.

7. Baseball. hit or hits.

8. hour or hours.

9. husband.

H (no period),

an abbreviation or symbol for the following:

1. of a lead pencil: a) hard. b) hardness.

2. henry (unit of electrical inductance).

3. histocompatibility.

4. hydrogen (chemical element).

5. Physics. a) intensity of magnetic field. b) the earth's horizontal component of magnetic field.

H¹ (no period),

protium (an isotope of hydrogen).

H² (no period),

heavy hydrogen; deuterium (an isotope of hydrogen).

H³ (no period),

tritium (an isotope of hydrogen).

H⁺ (no period),

hydrogen ion.

H.,

an abbreviation for the following:

1. harbor.

2. hard.

3. high.

4. hour.

5. (of a periodical publication) number; part (German, Heft).