Dictionary entry details
• H (noun)
Meaning:
A nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe
Classified under:
Nouns denoting substances
Synonyms:
atomic number 1; H; hydrogen
Hypernyms ("H" is a kind of...):
chemical element; element (any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter)
gas (a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely)
Hyponyms (each of the following is a kind of "H"):
tritium (a radioactive isotope of hydrogen; atoms of tritium have three times the mass of ordinary hydrogen atoms)
Holonyms ("H" is a substance of...):
H2O; water (binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent)
Meaning:
A unit of inductance in which an induced electromotive force of one volt is produced when the current is varied at the rate of one ampere per second
Classified under:
Nouns denoting quantities and units of measure
Synonyms:
henry; H
Hypernyms ("H" is a kind of...):
inductance unit (a measure of the property of an electric circuit by which an electromotive force is induced in it)
Meronyms (parts of "H"):
abhenry (a unit of inductance equal to one billionth of a henry)
millihenry (a unit of inductance equal to one thousandth of a henry)
Meaning:
The constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second
Classified under:
Nouns denoting quantities and units of measure
Synonyms:
Planck's constant; h
Hypernyms ("h" is a kind of...):
constant of proportionality; factor of proportionality (the constant value of the ratio of two proportional quantities x and y; usually written y = kx, where k is the factor of proportionality)
Meaning:
The 8th letter of the Roman alphabet
Classified under:
Nouns denoting communicative processes and contents
Synonyms:
letter h; H
Hypernyms ("H" is a kind of...):
alphabetic character; letter; letter of the alphabet (the conventional characters of the alphabet used to represent speech)
Holonyms ("H" is a member of...):
Latin alphabet; Roman alphabet (the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe)
Meaning:
(thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure
Classified under:
Nouns denoting attributes of people and objects
Synonyms:
enthalpy; heat content; total heat; H
Context example:
enthalpy is the amount of energy in a system capable of doing mechanical work
Hypernyms ("H" is a kind of...):
physical property (a property used to characterize physical objects)
Domain category:
thermodynamics (the branch of physics concerned with the conversion of different forms of energy)
