h 
1. the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second • Syn: Planck's constant • Hypernyms: factor of proportionality, constant of proportionality 2. the 8th letter of the Roman alphabet • Syn: H • Hypernyms: letter, letter of the alphabet, alphabetic character • Member Holonyms: Roman alphabet, Latin alphabet
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