
1) Benzene, toluene and xylene
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https://www.crosswordclues.com/clue/btx
[chemistry] In the petroleum refining and petrochemical industries, the initialism BTX refers to mixtures of benzene, toluene, and the three xylene isomers, all of which are aromatic hydrocarbons. The xylene isomers are distinguished by the designations ortho – (or o –), meta – (or m –), and para â...
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http://en.wikipedia.org/wiki/BTX_(chemistry)
[form factor] BTX (for Balanced Technology eXtended) is a form factor for motherboards, originally intended to be the replacement for the aging ATX motherboard form factor in late 2004 and early 2005. It was designed to alleviate some of the issues that arose from using newer technologies (which often demand more power and create more heat)...
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http://en.wikipedia.org/wiki/BTX_(form_factor)

<abbreviation> Brevotoxins. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973

Benzene, toluene and xylene.
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http://www.encyclo.co.uk/local/21049

Benzene, Toluene and Xylene. (Acronym)
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http://www.encyclo.co.uk/visitor-contributions.php

Type: Abbreviation Definitions: 1. Abbreviation for brevetoxins; botulinum toxin.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=12606

from BTX process, a mixture of benzene, toluene, xylene (oil)
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http://www.translationdirectory.com/glossaries/glossary136.htm
No exact match found.