2. Initialism. '''A'''rmy '''P'''ost '''O'''ffice ¹
3. Initialism. '''A'''ir Force '''P'''ost '''O'''ffice ¹
4. Adjective. (biochemistry of a protein) In an inactive, unbound state ¹
¹ Source: wiktionary.com
Definition of Apo
1. a type of protein [n APOS] - See also: protein