n.
Pronunciation: ( ˌ )in- ' v ə r-t ə -br ə t, - ˌ br ā t
Function: adjective
Etymology: New Latin invertebratus, from Latin in- + New Latin vertebratus vertebrate
Date: 1832
1 : lacking a spinal column also : of, relating to, or concerned with invertebrate animals
2 : lacking in strength or vitality : WEAK
– invertebrate noun