The word that the KJV of the bible abomination is toevah, as was mentioned. Other activities that were called 'Toevah' in Leviticus was eating pork, wearing fibers of mixed linen and wool, and menstruating women.
Now, much of this was how the Ancient Jews chose to keep their temple 'clean'. If someone does something that is 'Toevah', they had to go through a specific purification rite (immersion in water, or Mikveh) at the temple.
Now, Christians love to quote leviticus as a prohibition against homosexuality. It is a toevah. They ignore what Toevah actually means, and how it is handled to 'cure' something. It specifically was talking about temple behavior.
If you look at many of the items that are 'ritualistically unclean', it is referring to ceremonies taken from competing God's rituals in the area.
That being said, there is a general attitude through out the offical restrictions against sexual licentiousness that it is perfectly acceptable to consider those restriction a warning against homosexual behavior, and the orthodox Jews do indeed have that attitude.
Look up to'evah , that is the most common transliteration .
And for a discussion about To'evah from a site that is not specifically for homosexuals is
Spark of the Week 5754-27
Edited by ramoss, : No reason given.