apud

Latin, meaning: (prep. + acc.) among, in the presence of, at, at the house of.
Found on http://archives.nd.edu/aaa.htm

APUD

Synonym for Amine Precursor Uptake and Decarboxylation ... <pharmacology, physiology> Paracrine cells of which argentaffin cells are an example. Usage of the term APUD is neither helpful nor memorable. ... Acronym: APUD ... (11 Nov 1997) ...
Found on http://www.mondofacto.com/facts/dictionary?APUD

apud

Type: Abbreviation Definitions: 1. Designation for a group of cells in different organs secreting polypeptide hormones or neurotransmitters. Cells in this group have certain biochemical characteristics in common, the first letters of which form the acronym that designates the group; they contain amines, such as catecholamine and 5-hydroxytryptamine
Found on http://www.medilexicon.com/medicaldictionary.php?t=5813

APUD

Amine precursor uptake decarboxylase
Found on http://www.library.illinois.edu/vex/vetabbrev.htm
No exact match found