The Collaborative International Dictionary of English v.0.48:

Abstemious \Ab*ste"mi*ous\, a. [L. abstemius; ab, abs + root of
   temetum intoxicating drink.]
   1. Abstaining from wine. [Orig. Latin sense.]
      [1913 Webster]

            Under his special eye
            Abstemious I grew up and thrived amain. --Milton.
      [1913 Webster]

   2. Sparing in diet; refraining from a free use of food and
      strong drinks; temperate; abstinent; sparing in the
      indulgence of the appetite or passions.
      [1913 Webster]

            Instances of longevity are chiefly among the
            abstemious.                           --Arbuthnot.
      [1913 Webster]

   3. Sparingly used; used with temperance or moderation; as, an
      abstemious diet. --Gibbon.
      [1913 Webster]

   4. Marked by, or spent in, abstinence; as, an abstemious
      life. "One abstemious day." --Pope.
      [1913 Webster]

   5. Promotive of abstemiousness. [R.]
      [1913 Webster]

            Such is the virtue of the abstemious well. --Dryden.
      [1913 Webster]

WordNet (r) 3.0 (2006):

abstemious
    adj 1: sparing in consumption of especially food and drink; "the
           pleasures of the table, never of much consequence to one
           naturally abstemious"- John Galsworthy [ant:
           gluttonous]
    2: marked by temperance in indulgence; "abstemious with the use
       of adverbs"; "a light eater"; "a light smoker"; "ate a light
       supper" [syn: abstemious, light(a)]

Moby Thesaurus II by Grady Ward, 1.0:

68 Moby Thesaurus words for "abstemious":
   Apostolic, Encratic, Lenten, Pythagorean, Rechabite, Shaker,
   Spartan, Stoic, abstentious, abstinent, ascetic, austere, celibate,
   chaste, continent, dwarfed, dwarfish, exiguous, frugal, fruitarian,
   impoverished, jejune, lean, limited, meager, mean, miserly, narrow,
   nephalistic, niggardly, on the wagon, paltry, parsimonious, poor,
   puny, scant, scanty, scrawny, scrimp, scrimpy, self-abnegating,
   self-denying, sexually abstinent, skimp, skimpy, slender, slight,
   slim, small, sober, spar, spare, sparing, starvation, stingy,
   stinted, straitened, stunted, subsistence, sworn off, teetotal,
   temperate, thin, unnourishing, unnutritious, vegetarian, watered,
   watery