Adjacent Words

Hf definitions

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WordNet (r) 3.0 (2005)

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]

Merriam Webster's

abbreviation half

Merriam Webster's

symbol hafnium

Merriam Webster's

abbreviation high frequency

Oxford Reference Dictionary

abbr. high frequency.

Oxford Reference Dictionary

symb. Chem. the element hafnium.

Webster's 1913 Dictionary

Hydrofluoric Hy`dro*flu*or"ic, a. [Hydro-, 2 + fluoric.] (Chem.) Pertaining to, or containing, hydrogen and fluorine; fluohydric; as, hydrofluoric acid. 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.