The Collaborative International Dictionary of English v.0.48:

vernal \ver"nal\ (v[~e]r"nal), a. [L. vernalis, fr. vernus
   vernal, ver spring; akin to Gr. 'e`ar, Skr. vasanta, Icel.
   v[=a]r, and E. Easter, east.]
   1. Of or pertaining to the spring; appearing in the spring;
      as, vernal bloom.
      [1913 Webster]

            And purple all the ground with vernal flowers.
                                                  --Milton.
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   2. Fig.: Belonging to youth, the spring of life.
      [1913 Webster]

            When after the long vernal day of life. --Thomson.
      [1913 Webster]

            And seems it hard thy vernal years
            Few vernal joys can show?             --Keble.
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      [1913 Webster]

   Vernal equinox (Astron.), the point of time in each year
      when the sun crosses the equator when proceeding
      northward, about March 21, when day and night are of
      approximately equal duration. The beginning of the Spring
      season.

   Vernal grass (Bot.), a low, soft grass (Anthoxanthum
      odoratum), producing in the spring narrow spikelike
      panicles, and noted for the delicious fragrance which it
      gives to new-mown hay; -- also called sweet vernal
      grass. See Illust. in Appendix.

   Vernal signs (Astron.), the signs, Aries, Taurus, and
      Gemini, in which the sun appears between the vernal
      equinox and summer solstice.
      [1913 Webster]

WordNet (r) 3.0 (2006):

vernal
    adj 1: suggestive of youth; vigorous and fresh; "he is young for
           his age" [syn: youthful, vernal, young]
    2: of or characteristic of or occurring in spring; "the vernal
       equinox" [ant: autumnal, summery, wintery, wintry]

Moby Thesaurus II by Grady Ward, 1.0:

113 Moby Thesaurus words for "vernal":
   aestival, arctic, autumn, autumnal, beryl-green, berylline,
   blue-green, bluish-green, boreal, brumal, budding, callow,
   canicular, chartreuse, chloranemic, chlorine, chlorotic, citrine,
   citrinous, dewy, emerald, equinoctial, ever-new, evergreen,
   firsthand, fledgling, foliaged, fresh, glaucescent, glaucous,
   glaucous-green, grassy, green, green as grass, green-blue,
   greenish, greenish-blue, greenish-yellow, greensick, growing,
   hibernal, hiemal, holly, immature, impubic, inexperienced,
   ingenuous, innocent, intact, ivy, ivy-green, juicy, leafy, leaved,
   maiden, maidenly, midsummer, midwinter, minor, naive, neoteric,
   nestling, new, new-fledged, olivaceous, olive, olive-green,
   original, out of season, porraceous, pristine, raw, ripening,
   sappy, seasonal, sempervirent, smaragdine, solstitial, spring,
   springlike, summer, summerlike, summerly, summery, tender, unadult,
   unbeaten, underage, undeveloped, unfledged, unformed, unhandled,
   unlicked, unmellowed, unripe, unseasoned, untouched, untried,
   untrodden, unused, verdant, verdurous, vernant, vert, virescent,
   virgin, virginal, winter, winterlike, wintery, wintry,
   yellowish-green, young



U.S. Gazetteer Places (2000):

Vernal, UT -- U.S. city in Utah
   Population (2000):    7714
   Housing Units (2000): 2957
   Land area (2000):     4.582314 sq. miles (11.868137 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    4.582314 sq. miles (11.868137 sq. km)
   FIPS code:            80090
   Located within:       Utah (UT), FIPS 49
   Location:             40.454758 N, 109.535471 W
   ZIP Codes (1990):     84078
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Vernal, UT
    Vernal