What is the meaning of cf?

noun

• A radioactive transuranic element; discovered by bombarding curium with alpha particles.
  • synonyms: californium, atomic number 98
• The most common congenital disease; the child's lungs and intestines and pancreas become clogged with thick mucus; caused by defect in a single gene; no cure is known.
  • synonyms: cystic fibrosis, fibrocystic disease of the pancreas, pancreatic fibrosis, mucoviscidosis

adverb

• Compare (used in texts to point the reader to another location in the text. ).
  • synonyms: cf.