WordRel.com

• a sharp rigid animal process or appendage; as a porcupine quill or a ridge on a bone or a ray of a fish fin

  derivation	spinalspinous
  hypernym	appendageoutgrowthprocess
  hyponym	quillray

• 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

  synonym	backbone
  holo part	bookvolume
  hypernym	partportion

• the series of vertebrae forming the axis of the skeleton and protecting the spinal cord

  synonym	backbackbonerachisspinal columnvertebral column
  derivation	spinal
  holo part	axial skeleton
  hypernym	skeletal structure
  hyponym	chinenotochord
  mero part	canalis vertebraliscoccyxintervertebral discintervertebral diskspinal canaltail bonevertebravertebral canal

• a small sharp-pointed tip resembling a spike on a stem or leaf

  synonym	prickerpricklespikeletstickerthorn
  derivation	spinous
  hypernym	aculeus
  hyponym	glochidglochidium

• any sharply pointed projection

  synonym	acanthaspur
  derivation	spinous
  hypernym	projection