Obs. rare–1. [as if ad. L. *effuscātiōn-em, f. ex out + fuscā-re to darken.] The action of making obscure; a beclouding.
1624. Donne, Devotions, (1634), A 7. These eclipses, suddaine effuscations [1624 offuscations], and darkenings of his senses.
