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ephemera    
n. 生命极短促之物,蜉蝣

生命极短促之物,蜉蝣

ephemera
n 1: something transitory; lasting a day

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]


Ephemera \E*phem"e*ra\, 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["o]l.) A genus of insects including the day flies, or
ephemeral flies. See {Ephemeral fly}, under {Ephemeral}.
[1913 Webster]


Ephemeron \E*phem"e*ron\, n.; pl. {Ephemera}. [NL. See
{Ephemera}.] (Zo["o]l.)
One of the ephemeral flies.
[1913 Webster]


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