Webster's English Dictionary

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invertebrate

in.ver.te.brate \(')in-'v*rt-*-br*t, -.bra-t\ aj [NL invertebratus, fr. L 
   in- + NL vertebratus vertebrate] 1: lacking a spinal column; also : of or 
   relating to invertebrate  animals 2: lacking in strength or vitality : WEAK 
    - invertebrate n