The Letter H is pronounced [eych] noun, plural H's or Hs, h's or hs. 1.the eighth letter of the English alphabet, a consonant. 2.any spoken sound represented by the letter H or h, as in hot or behave. 3.something having the shape of an H . 4.a written or printed representation of the letter H or h. 5.a device, as a printer's type, for reproducing the letter H or h.