WordNet (r) 3.0 (2006):

Ingres
    n 1: French classical painter (1780-1867) [syn: Ingres, Jean
         Auguste Dominique Ingres]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

INGRES
       INteractive Graphic REtrieval System


The Free On-line Dictionary of Computing (30 December 2018):

INGRES

   A relational DBMS vendor.