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tri-fluoride
tri-fluoride n. 
/(ˌ)trʌɪˈflɔːrʌɪd/, /ˌtraɪˈflɔˌraɪd/
Brit. /(ˌ)trʌɪˈflʊərʌɪd/
, /(ˌ)trʌɪˈflʊərʌɪd//(ˌ)trʌɪˈflɔːrʌɪd/U.S. /ˌtraɪˈflʊˌraɪd/
, /ˌtraɪˈflʊˌraɪd//ˌtraɪˈflɔˌraɪd/ΚΠ
1850 C. G. B. Daubeny Introd. Atomic Theory (ed. 2) 338 The gaseous trifluoride of boron, which contains no hydrogen.
1880 H. E. Roscoe & C. Schorlemmer Treat. Chem. II. ii. 319 Antimony Trifluoride, SbF3, is obtained as a dense snow-white mass, by distilling antimony with mercury fluoride.
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