Etymology
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efflorescence (n.)

1620s, "a bursting into flower, act of blossoming out," from French efflorescence, from Latin efflorescentem (nominative efflorescens), present participle of efflorescere "to bloom, flourish, blossom," from assimilated form of ex "out" (see ex-) + florescere "to blossom," from flos "flower" (from PIE root *bhel- (3) "to thrive, bloom"). Sense in chemistry is from 1660s.

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Definitions of efflorescence

efflorescence (n.)
the period of greatest prosperity or productivity;
Synonyms: flower / prime / peak / heyday / bloom / blossom / flush
efflorescence (n.)
any red eruption of the skin;
Synonyms: rash / roseola / skin rash
efflorescence (n.)
the time and process of budding and unfolding of blossoms;
Synonyms: blossoming / flowering / florescence / inflorescence / anthesis
efflorescence (n.)
a powdery deposit on a surface;
Synonyms: bloom
From wordnet.princeton.edu