h

1. (in measuring the height of horses) hand(s).

   pinto pony gelding—quiet, 13.3 h, great with kids

2. (in units of measurement) hecto-.

   wine production reached 624,000 hl last year

3. (with reference to sporting fixtures) home.

   September 14 Bradford City (h)

4. horse.
5. (especially with reference to water) hot.

   nine rooms, all with h & c

6. hour(s).

   breakfast at 0700 h

1. Planck's constant.
2. Planck's constant divided by 2π.

1. the eighth letter of the alphabet.
2. a shape like that of a capital H.

   a widened H-strap for lateral support

3. (in the German system) the note B natural.

1. hard (used in describing grades of pencil lead).

   a 2H pencil

2. height (in giving the dimensions of an object).

   H 195 cm by W 107 cm by D 52 cm

3. henry(s).
4. heroin.

   ‘Tell me it's not heroin.’ ‘It's not H’

5. Hungary (international vehicle registration).
6. (on signs in the street) hydrant.

1. enthalpy.
2. the chemical element hydrogen.
3. magnetic field strength.

noun, symbol

a thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume.

early 20th century: from Greek enthalpein ‘warm in’, from en- ‘within’ + thalpein ‘to heat’.

noun, symbol

the SI unit of inductance, equal to an electromotive force of one volt in a closed circuit with a uniform rate of change of current of one ampere per second.

late 19th century: named after Joseph Henry (1797–1878), the American physicist who discovered the phenomenon.

noun, symbol

a colourless, odourless, highly flammable gas, the chemical element of atomic number 1.

late 18th century: coined in French from Greek hudro- ‘water’ + -genēs (see -gen).