avertebratedadj.

/əˈvəːtɪbreɪtɪd/Etymology: < a- prefix6 + vertebrated adj.
rare.
the world > animals > invertebrates > [adjective]
1860 XXI. 974/2 Very few avertebrated animals are vermiparous.
This entry has not yet been fully updated (first published 1885; most recently modified version published online June 2021).