1. tammuz - Noun
2. Tammuz - Proper noun
A deity among the ancient Syrians, in honor of whom the Hebrew idolatresses held an annual lamentation. This deity has been conjectured to be the same with the Phoenician Adon, or Adonis.
The fourth month of the Jewish ecclesiastical year, -- supposed to correspond nearly with our month of July.
Source: Webster's dictionaryThe Mishnah cites five negative events that happened on 17 Tammuz. Source: Internet
Thus, Conservative Jewish practice would allow weddings during this time, except on the 17th of Tammuz and 9th of Av themselves. Source: Internet