spine (suomeksi)

selkäranka (s: backbone / metaphor for courage or assertiveness)
piikki (s: eläimen tai kasvin / rigid, pointed surface protuberance or needle-like structure on an animal, shell, or plant)
kirjanselkä (s)
selkä (s: bound edge of a book)
oas (s: rigid, pointed surface protuberance or needle-like structure on an animal, shell, or plant)