The Collaborative International Dictionary
Chromic \Chro"mic\, a. (Chem.) Pertaining to, or obtained from, chromium; -- said of the compounds of chromium in which it has its higher valence.
Chromic acid, an acid, H2CrO4, analogous to sulphuric acid, not readily obtained in the free state, but forming well known salts, many of which are colored pigments, as chrome yellow, chrome red, etc.
Chromic anhydride, a brilliant red crystalline substance, CrO3, regarded as the anhydride of chromic acid. It is one of the most powerful oxidizers known.
Wiktionary
n. (context inorganic compound English) A corrosive acid, H2CrO4, known only in solution or as its salts, the chromates (from which it may be prepared); it is a very powerful oxidizing agent.
WordNet
n. an unstable acid known only in solution and as chromate salts
Wikipedia
The term chromic acid is usually used for a mixture made by adding concentrated sulfuric acid to a dichromate, which may contain a variety of compounds, including solid chromium trioxide. This kind of chromic acid may be used as a cleaning mixture for glass. Chromic acid may also refer to the molecular species, HCrO of which the trioxide is the anhydride. Chromic acid features chromium in an oxidation state of +6 (or VI). It is a strong and corrosive oxidising agent.
Usage examples of "chromic acid".
So I wired to London for Morgan, and, between him and Johnson, they have been opening my trachea, and singeing my inside with chromic acid and the cautery.
Then he started the tedious job of swabbing the metal surfaces with a mild solution of chromic acid to bring out the shine of the brass.
Janice Rand had been cleaning some of McCoy's slides in a beaker of chromic acid.