Webster's Revised Unabridged Dictionary · 1913

Efflorescent

Efflorescent , adjective

[French efflorescent, Latin efflorescens, -entis, blooming, present participle of efflorescere. See Effloresce, v. i.]

1.
That effloresces, or is liable to effloresce on exposure; as, an efflorescent salt.
2.
Covered with an efflorescence.