a.c

ante cibum (before food)

a.c

ante cibum (before food)

A.C

Alternating Current: an electric current which continually reverses its direction of flow in a regular fashion. The vast majority of electricity supply systems use A.C. The other system of electric current transmission is Direct Current (D.C.).
Found on http://www.mhs.ox.ac.uk/marconi/collection/glossary.php
No exact match found