Backbone
Chamber's Etymological of the English Language · 1895 · p. 42
bak'bon, n. the bone of the back, the vertebral column. Backdoor, bak'ddr, a door in the back part of a building.
Bu kavram başka kaynaklarda da geçiyor
Appleton's Medical Dictionary (1913)
A Dictionary of Aviation (1911)
The American Dictionary and Cyclopedia (1910)
An Illustrated Encyclopaedic Medical Dictionary (1891)
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