— postally , adv.
/pohs"tl/ , adj.
1. of or pertaining to the post office or mail service: postal delivery; postal employees.
2. go postal , Slang. to lose control or go crazy.
n.
3. Informal. See postal card .
[ 1835-45; POST 3 + -AL 1 ; def. 2 in reference to incidents of violence among postal workers in the early 1990s ]