flare

²flare

noun

Definition of FLARE

1

: a sudden outburst or worsening of a disease <acute flares in rheumatoid arthritis—Emergency Medicine>—see flare-up

2

: an area of skin flush resulting from and spreading out from a local center of vascular dilation and hyperemia <urticarial flare>

3

: the presence of floating particles in the fluid of the anterior chamber of the eye—called also aqueous flare