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WordNet (r) 3.0 (2006) (WordNet)

cf
adv 1: compare (used in texts to point the reader to another
location in the text) [synonym: {cf.}, {cf}]
n 1: a radioactive transuranic element; discovered by bombarding
curium with alpha particles [synonym: {californium}, {Cf},
{atomic number 98}]
2: 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 [synonym:
{cystic fibrosis}, {CF}, {fibrocystic disease of the
pancreas}, {pancreatic fibrosis}, {mucoviscidosis}]