1. (adjective) lacking a backbone or spinal column

• spineless

1. (noun) any animal lacking a backbone or notochord; the term is not used as a scientific classification

• animal
• animate being
• beast
• brute
• creature
• fauna

1. (noun) any animal lacking a backbone or notochord; the term is not used as a scientific classification

• arthropod
• borer
• woodborer
• brachiopod
• lamp shell
• lampshell
• bryozoan
• moss animal
• polyzoan
• sea mat
• sea moss
• cnidarian
• coelenterate
• comb jelly
• ctenophore
• echinoderm
• ectoproct
• entoproct
• mollusc
• mollusk
• shellfish
• parazoan
• poriferan
• sponge
• peanut worm
• sipunculid
• phoronid
• rotifer
• symbion pandora
• worm
• zoophyte

1. (noun) any animal lacking a backbone or notochord; the term is not used as a scientific classification

• exoskeleton

1. (adjective) lacking a backbone or spinal column

• zoological science
• zoology

1. (adjective) lacking a backbone or spinal column

• vertebrate