Definition of pneumonoultramicroscopicsilicovolcanoconiosis in English:

pneumonoultramicroscopicsilicovolcanoconiosis

Line breaks: pneu¦mono|ultra|micro|scopic|silico|vol¦cano|coni|osis
Pronunciation: /ˌnjuːmənəʊˌʌltrəˌmʌɪkrə(ʊ)ˈskɒpɪkˌsɪlɪkəʊvɒlˌkeɪnəʊˌkəʊnɪˈəʊsɪʃ, njʊˌməʊnəʊ-/

Entry from British & World English dictionary

noun

[mass noun]
An artificial long word said to mean a lung disease caused by inhaling very fine ash and sand dust.

Definition of pneumonoultramicroscopicsilicovolcanoconiosis in:

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Word of the day noisome
Pronunciation: ˈnɔɪs(ə)m
adjective
having an extremely offensive smell