/thuy'seuh noor"euhn, -nyoor"-, this'euh-/ , adj.
1. Also, thysanurous . belonging or pertaining to the order Thysanura, comprising the bristletails.
n.
2. a thysanuran insect; bristletail.
[ 1820-30; Thysanur ( a ) ( thýsan ( os ) tassel + -oura, neut. pl. of -ouros -tailed, adj. deriv. of ourá tail) + -AN ]