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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Ferric \Fer"ric\, adjective [L. ferrum iron: cf. F. ferrique. See {Ferrous}.] Pertaining to, derived from, or containing iron. Specifically (Chem.), denoting those compounds in which iron has a higher valence than in the ferrous compounds; as, ferric oxide; ferric acid.
{Ferric acid} (Chem.), an acid, {H2FeO4}, which is not known in the free state, but forms definite salts, analogous to the chromates and sulphates.
{Ferric oxide} (Chem.), sesquioxide of iron, {Fe2O3}; hematite. See {Hematite}.
From WordNet (r) 2.0 [wn]:
ferric
adjective: of or relating to or containing iron [syn: {ferrous}]
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