PIGS

Noun

 * 1)  Phosphatidylinositol glycan anchor biosynthesis, class S, a human gene.

Proper noun

 * 1)  Portugal, Italy, Greece and Spain, countries of Southern Europe noted for similar economic environments.
 * 2)  Portugal, Ireland, Greece and Spain, four countries that were unable to refinance their government debt or to bail out over-indebted banks on their own.
 * 1)  Portugal, Ireland, Greece and Spain, four countries that were unable to refinance their government debt or to bail out over-indebted banks on their own.