a North American rubiaceous plant, Houstonia caerulea, with small four-petalled blue flowers
bluet in American English
(ˈbluːɪt)
noun
1. (usually bluets) Also called: innocence, Quaker-ladies
any of several North American plants of the genus Houstonia (or Hedyotis), of the madder family, esp. H. caerulea, a low-growing plant having four-petaled blue and white flowers
2.
any of various other plants having blue flowers
Word origin
[1400–50; late ME blewet, blewed, var. of ME bloweth, blowed ( see blue, blae); suffix perh. OE -et, as in thicket]