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noun
ChemistryLead tetrahydride, PbH₄, an extremely unstable gas; (more generally) any of a (largely hypothetical) series of lead hydrides, analogous to the alkanes, of which PbH₄ is the simplest member.
Frequently as a formative element in the names of alkyl compounds of lead, regarded as substituted lead hydrides.
Origin
Early 19th century (in an earlier sense). From classical Latin plumbum lead + -ane.
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