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Wordnet 3.0

NOUN (2)

1. a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons;
[syn: hafnium, Hf, atomic number 72]

2. 3 to 30 megahertz;
[syn: high frequency, HF]


The Collaborative International Dictionary of English v.0.48:

Hydrofluoric \Hy`dro*flu*or"ic\, a. [Hydro-, 2 + fluoric.] (Chem.) Pertaining to, or containing, hydrogen and fluorine; fluohydric; as, hydrofluoric acid. [1913 Webster] Hydrofluoric acid (Chem.), a colorless, mobile, volatile liquid, HF, very corrosive in its action, and having a strong, pungent, suffocating odor. It is produced by the action of sulphuric acid on fluorite, and is usually collected as a solution in water. It attacks all silicates, as glass or porcelain, is the agent employed in etching glass, and is preserved only in vessels of platinum, lead, caoutchouc, or gutta-percha. [1913 Webster]
WordNet (r) 3.0 (2006):

Hf n 1: a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons [syn: hafnium, Hf, atomic number 72] 2: 3 to 30 megahertz [syn: high frequency, HF]
V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

HF Have Fun (slang, Usenet, IRC)