[1] : The Collaborative International Dictionary of English v.0.48

vernal \ver"nal\ v~er"nal, a. l. vernalis, fr. vernus
   vernal, ver spring; akin to gr. 'e`ar, skr. vasanta, icel.
   v=ar, 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.
      1913 webster

   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.
      1913 webster
      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
see also:
vernal equinox vernal grass anthoxanthum odoratum sweet vernal grass vernal signs 

[2] : WordNet (r) 2.0

vernal equinox
     n 1: march 21 syn: march equinox, spring equinox ant: autumnal
          equinox
     2: astronomy the equinoctial point that lies in the
        constellation of pisces
see also:
march equinox spring equinox autumnal equinox 

[3] : Moby Thesaurus II by Grady Ward, 1.0

34 moby thesaurus words for "vernal equinox":
   aphelion, apogee, astronomical longitude, autumnal equinox,
   celestial equator, celestial longitude, celestial meridian, circle,
   colures, ecliptic, equator, equinoctial, equinoctial circle,
   equinoctial colure, equinox, galactic longitude,
   geocentric longitude, geodetic longitude, great circle,
   heliocentric longitude, longitude, meridian, orbit, perigee,
   perihelion, period, small circle, solstice, solstitial colure,
   summer solstice, trajectory, winter solstice, zodiac, zone

Vernal Equinox >> V Words
Vernal Equinox, definition of term: Vernal Equinox
vernal+equinox_pag1.html

Vernal >> V Words
Vernal, definition of term: Vernal
vernal_pag1.html

Equinox >> E Words
Equinox, definition of term: Equinox
equinox_pag1.html

Fall Equinox >> F Words
Fall Equinox, definition of term: Fall Equinox
fall+equinox_pag1.html