from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of several compounds composed of phosphorus and hydrogen having a general formula PnHn+2.

from The Century Dictionary.

  • noun A light white powder obtained by the interaction of ammonia and phosphorus pentachlorid. Its composition is somewhat doubtful, but is probably represented by the formula P3H3N6.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun chemistry phosphine, PH3
  • noun chemistry any of the higher hydrides of phosphorus having general formula PnHn+2


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