Answer: backbones

AnswerCrossword Clue
BACKBONESMain supports.
BACKBONESCertain columns.
BACKBONESGuts
backbonesThe main chain of a polymeric molecule
backbonesBACKBONE, the spine (the vertebral column)
backbonesA high-speed, high-capacity digital connection which forms the axis of a local or wide area network
backbonesThe spine of a book
backbonesThe chief support of a system or organization; the mainstay
backbonesStrength of character; firmness