The authoritative instrument for the distribution of all forms of official IRS tax guidance is the Internal Revenue Bulletin (IRB), a weekly collection of these and other items of general interest to the tax professional community.
perfidy definition: The definition of a perfidy is a deliberate betrayal. (noun) An example of a perfidy is spreading a best friend's secrets all over town....
perÂ·iÂ·osÂ·teÂ·um. The dense fibrous membrane covering the surface of bones except at the joints and serving as an attachment for muscles and tendons. perâ²iÂ·osâ²teÂ·al (-tÄ-Él), perâ²iÂ·osâ²teÂ·ous (-tÄ-És) adj. periosteum. (Anatomy) a thick fibrous two-layered membrane covering the surface of bones.