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

june \june\, n. l. junius: cf. f. juin. so called either from
   junius, the name of a roman gens, or from juno, the goddess.
   the sixth month of the year, containing thirty days.
   1913 webster

         and what is so rare as a day in june?
         then, if ever, come perfect days.        --lowell.
   1913 webster

   june beetle, june bug zool., any one of several species
      of large brown beetles of the genus lachnosterna and
      related genera; -- so called because they begin to fly, in
      the northern united states, about the first of june. the
      larvae of the june beetles live under ground, and feed
      upon the roots of grasses and other plants. called also
      may bug or may beetle.

   june grass bot., a new england name for kentucky blue
      grass. see blue glass, and illustration in appendix.
      1913 webster
see also:
june beetle june bug lachnosterna may bug may beetle june grass 
blue glass 

[2] : WordNet (r) 2.0

june
     n : the month following may and preceding july

June >> J Words
June, definition of term: June
june_pag1.html

June Grass >> J Words
June Grass, definition of term: June Grass
june+grass_pag1.html

June Beetle >> J Words
June Beetle, definition of term: June Beetle
june+beetle_pag1.html

June Bug >> J Words
June Bug, definition of term: June Bug
june+bug_pag1.html