• Webster's Revised Unabridged Dictionary
    • a Metantimonic (Chem) Pertaining to, or designating, an acid (formerly called antimonic acid) analogous to metaphosphoric acid, and obtained as a white amorphous insoluble substance, (HSbO3).
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Century Dictionary and Cyclopedia
    • metantimonic Noting an acid, HSbO3, obtained by heating ortho-antimonic acid to 175° C. The metantimonic acid of Frémy (H4Sb2O7) is now called pyro-antimonic acid, thus preserving analogy with the different phosphoric acids.
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Webster's Revised Unabridged Dictionary
Pref. met-, + antimonic,


In literature:

Metantimonic acid, HSbO3, can be obtained by heating orthoantimonic acid to 175 deg.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2" by Various