phosphane

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 P_nH_n+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