from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The vertebrate spine or spinal column.
- n. Something, such as the keel of a ship, that resembles a backbone.
- n. A main support or major sustaining factor: the backbone of a thesis.
- n. Geology A ridge forming the principal axis of a mountain.
- n. Geology The principal mountain ridge, range, or system of a region.
- n. Chemistry The main chain of atoms in a polymer.
- n. Strength of character; determination: displayed grit and backbone in facing adversity.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The series of vertebrae, separated by disks, that encloses and protects the spinal cord, and runs down the middle of the back in vertebrate animals.
- n. any fundamental support, structure, or infrastructure
- n. courage, fortitude, or strength
from the GNU version of the Collaborative International Dictionary of English
- n. The column of bones in the back which sustains and gives firmness to the frame; the spine; the vertebral or spinal column.
- n. Anything like , or serving the purpose of, a backbone.
- n. Firmness; moral principle; steadfastness.
from The Century Dictionary and Cyclopedia
- n. The bone of the middle line of the back; the spine; the vertebral column; the vertebræ collectively.
- n. Something resembling a backbone in appearance, position, or office: as, the Apennines are the backbone of Italy.
- n. Figuratively, firmness; stability of purpose; decision of character; resolution; moral principle.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the part of a network that connects other networks together
- n. the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
- n. the part of a book's cover that encloses the inner side of the book's pages and that faces outward when the book is shelved
- n. fortitude and determination
- n. a central cohesive source of support and stability
From back + bone. (Wiktionary)