What are the word records for spelled with chemical symbols, longest?

language/english/spelling/letters.selected.from.given.set/entire.word/spelled.with.chemical.symbols New

New entry, edited from material collected for the archive and not yet in a released version.

Problem

What are the word records for spelled with chemical symbols, longest?
(Spelling / Letters Selected from Given Set / Entire Word)

[ Editor: question framed by the editor from the headings of the Taxonomy of Wordplay. ]

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[ Editor: from the Taxonomy of Wordplay, www.questrel.com, retrieved 28 Oct 2026. Classes (common, uncommon, hyphenated words, phrases), scores, ties (-t) and the source codes in brackets are explained in language/english/word.records.introduction. ]

Sources: [7-198,9-42]

common word: underrepresentation (19)
uncommon word: hypothalamicohypophyseal (24)
phrases: infectious necrotic hepatitises, pneumocystis carinii pneumonias (29-t)

-- Taxonomy of Wordplay, www.questrel.com