ephemerid

/ih-fem-er-id/US // ɪˈfɛm ər ɪd //UK // (ɪˈfɛmərɪd) //

昙花一现,瞬息万变,昙花一现的人,瞬息万变的

Definitions

n.名词 noun

They are like the Ephemerid insects which live for a summer day only.
In the Ephemerid they lie in planes approaching the vertical, slightly diverging from each other towards their extremities.
I do not propose in this work to deal with Ephemerid, as the wings in the imitations now sold are in the natural position.
Those examples are provided by Rotifera (inferior worms) and by Ephemerid.
Ephemeral′ity; Ephem′erid, an insect belonging to the group Ephemerid.