|A pint of delicious bitter shot by Brian Clift|
Adjective. Late 17th century.
[from Latin bibax, -acis + -OUS.]
Given to drinking, bibulous.
If you check the word bibacious in other references, it often gives the definition of "addicted to drinking" or, basically, alcoholic. That's not what the OED says, of course, and Collins 20th Century Dictionary seems to agree with the milder definition, giving it as "one who drinks or tipples".
It's not an area of clearly divided definitions, of course, but there are many people that look forward to a pint of beer or glass of wine after work and it would be a stretch indeed to suggest that they're alcoholic. Therefore, in its OED definition, bibacious seems a useful word to describe someone that likes a few drinks but would not be described as having a drinking problem.
Right. That's done. Now I fancy a pint - mainly down to looking at Brian's rather excellent picture.