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

may \may\, n. f. mai, l. maius; so named in honor of the
   goddess maia gr. mai^a, daughter of atlas and mother of
   mercury by jupiter.
   1. the fifth month of the year, containing thirty-one days.
      --chaucer.
      1913 webster

   2. the early part or springtime of life.
      1913 webster

            his may of youth, and bloom of lustihood. --shak.
      1913 webster

   3. bot. the flowers of the hawthorn; -- so called from
      their time of blossoming; also, the hawthorn.
      1913 webster

            the palm and may make country houses gay. --nash.
      1913 webster

            plumes that mocked the may.           --tennyson.
      1913 webster

   4. the merrymaking of may day. --tennyson.
      1913 webster

   italian may bot., a shrubby species of spiraea
      spiraea hypericifolia with many clusters of small
      white flowers along the slender branches.

   may apple bot., the fruit of an american plant
      podophyllum peltatum. also, the plant itself
      popularly called mandrake, which has two lobed leaves,
      and bears a single egg-shaped fruit at the forking. the
      root and leaves, used in medicine, are powerfully drastic.
      

   may beetle, may bug zool., any one of numerous species
      of large lamellicorn beetles that appear in the winged
      state in may. they belong to melolontha, and allied
      genera. called also june beetle.

   may day, the first day of may; -- celebrated in the rustic
      parts of england by the crowning of a may queen with a
      garland, and by dancing about a may pole.

   may dew, the morning dew of the first day of may, to which
      magical properties were attributed.

   may flower bot., a plant that flowers in may; also, its
      blossom. see mayflower, in the vocabulary.

   may fly zool., any species of ephemera, and allied
      genera; -- so called because the mature flies of many
      species appear in may. see ephemeral fly, under
      ephemeral.

   may game, any may-day sport.

   may lady, the queen or lady of may, in old may games.

   may lily bot., the lily of the valley convallaria
      majalis.

   may pole. see maypole in the vocabulary.

   may queen, a girl or young woman crowned queen in the
      sports of may day.

   may thorn, the hawthorn.
      1913 webster
see also:
italian may spiraea spiraea hypericifolia may apple podophyllum peltatum mandrake 
may beetle may bug melolontha june beetle may day 
may dew may flower mayflower may fly ephemera 
ephemeral fly ephemeral may game may lady may lily 
convallaria majalis may pole maypole may queen may thorn 

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

ephemera \ephem"era\, n. nl., fr. gr. ? a day fly, fr. ?
   daily, lasting but a day; ? over + ? day.
   1. med. a fever of one day's continuance only.
      1913 webster

   2. zo"ol. a genus of insects including the day flies, or
      ephemeral flies. see ephemeral fly, under ephemeral.
      1913 webster
see also:
ephemeral fly ephemeral 

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

ephemeron \ephem"eron\, n.; pl. ephemera. nl. see
   ephemera. zo"ol.
   one of the ephemeral flies.
   1913 webster
see also:
ephemera 

[4] : WordNet (r) 2.0

ephemera
     see ephemeron
     also: ephemerae pl
see also:
ephemeron ephemerae 

[5] : WordNet (r) 2.0

ephemera
     n 1: something transitory; lasting a day
     2: an insect that lives only for a day in its winged form syn:
         ephemeron
     also: ephemerae pl
see also:
ephemeron ephemerae 

[6] : WordNet (r) 2.0

ephemeron
     n : an insect that lives only for a day in its winged form syn:
          ephemera
     also: ephemera pl
see also:
ephemera 

Ephemera >> E Words
Ephemera, definition of term: Ephemera
ephemera_pag1.html