Source : Webster's Revised Unabridged Dictionary (1913)

Henry \Hen"ry\, n.; pl. {Henrys}. [From Joseph Henry, an
   American physicist.]
   The unit of electric induction; the induction in a circuit
   when the electro-motive force induced in this circuit is one
   volt, while the inducing current varies at the rate of one
   amp[`e]re a second.

Source : WordNet®

henry
     n 1: 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 [syn: {H}]
     2: English chemist who studied the quantities of gas absorbed
        by water at different temperatures and under different
        pressures (1775-1836) [syn: {William Henry}]
     3: a leader of the American Revolution and a famous orator who
        spoke out against British rule of the American colonies
        (1736-1799) [syn: {Patrick Henry}]
     4: United States physicist who studied electromagnetic
        phenomena (1791-1878) [syn: {Joseph Henry}]

Source : Free On-Line Dictionary of Computing

henry
     
         (H) The {SI} unit of inductance: one henry is the
        inductance of a closed loop in which the induced voltage is
        one volt if the current flowing through it changes by one
        ampere each second, i.e., 1 H = 1 Vs/A.  Named after the
        American physicist Joseph Henry (1797-1878).
     
        (1997-03-16)