j /ˈʤe/
 字母j


 J J is the tenth letter of the English alphabet. It is a later variant form of the Roman letter I, used to express a consonantal sound, that is, originally, the sound of English y in yet. The forms J and I have, until a recent time, been classed together, and they have been used interchangeably.
 Note: In medical prescriptions j is still used in place of i at the end of a number, as a Roman numeral; as, vj, xij.
 J is etymologically most closely related to i, y, g; as in jot, iota; jest, gesture; join, jugular, yoke. See I.
 J is a compound vocal consonant, nearly equivalent in sound to dzh. It is exactly the same as g in gem. See Guide to Pronunciation, §§ 179, 211, 239.

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 J
      n 1: a unit of electrical energy equal to the work done when a
           current of one ampere passes through a resistance of one
           ohm for one second [syn: joule, watt second]
      2: the 10th letter of the Roman alphabet