1540s, "pertaining to a crown" (or, later, to one of the extended senses of Latin corona), from French coronal (16c.), from Latin coronalis "of or pertaining to a crown," from corona "a crown" (see crown (n.)).

"virus that parasitizes a bacterium by infecting it and reproducing inside it," 1921, from French bactériophage (1917), from bacterio-, combining form of bacteria, + -phage.

1670s, "a small crown," from Latin corolla "a garland, a little crown," diminutive of corona "crown, garland" (see crown (n.)). Botanical use is from 1753. Related: Corollaceous.