Brachiolaria \Brach`i*o*la"ri*a\, n. pl. [NL., fr. L. brachiolum
(bracch-), dim. of brachium (bracch-) arm.] (Zool.)
A peculiar early larval stage of certain starfishes, having a
bilateral structure, and swimming by means of bands of
vibrating cilia.
[1913 Webster]