资料来源 : Webster's Revised Unabridged Dictionary (1913)

Michaelmas \Mich"ael*mas\, n. [Michael + mass religious service;
   OE. Mighelmesse.]
   The feat of the archangel Michael, a church festival,
   celebrated on the 29th of September. Hence, colloquially,
   autumn.

   {Michaelmas daisy}. (Bot.) See under {Daisy}.

Daisy \Dai"sy\, n.; pl. {Daisies}. [OE. dayesye, AS.
   d[ae]ges?eage day's eye, daisy. See {Day}, and {Eye}.] (Bot.)
   (a) A genus of low herbs ({Bellis}), belonging to the family
       Composit[ae]. The common English and classical daisy is
       {B. prennis}, which has a yellow disk and white or
       pinkish rays.
   (b) The whiteweed ({Chrysanthemum Leucanthemum}), the plant
       commonly called {daisy} in North America; -- called also
       {oxeye daisy}. See {Whiteweed}.

   Note: The word daisy is also used for composite plants of
         other genera, as {Erigeron}, or fleabane.

   {Michaelmas daisy} (Bot.), any plant of the genus Aster, of
      which there are many species.

   {Oxeye daisy} (Bot.), the whiteweed. See {Daisy}
   (b) .

资料来源 : WordNet®

Michaelmas daisy
     n : North American perennial herb having small autumn-blooming
         purple or pink or white flowers; widely naturalized in
         Europe [syn: {New York aster}, {Aster novi-belgii}]