Question

which is longest spelling in world according to Oxford university​

Answer 1

pneumono ultra microscopic silico volcanoconiodis- this word refers to a lung disease contracted from the inhalation of very fine silica particle.specially from a volcano;

medically it is termed as silicosis.

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Answer 2

The longest word in dictionary is

pneumonoultramicroscopicsilicovolcanoconiosis.

Which is comprised of 45 letters. This word means a lung disease caused by inhaling very fine ash or sand dust.