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Dichlorodiphenyltrichloroethane, one of the most well-known synthetic pesticides.
Other long words include:

electroencephalographically
octamethylpyrophosphoramide
ethylenediaminetetraacetic
laryngotracheobronchitides
meningoencephalomyelitides
pneumoencephalographically
electrocorticographically
electroencephalographical
immunoelectrophoretically
panhysterosalpingectomies
syngenesiotransplantation
tetrabromophenolphthalein
ureteropyelonephrostomies
ventriculocisternostomies
cholangiopancreatography
cholecystoduodenostomies
electrocardiographically
electroencephalographies
hysterotrachelorrhaphies
laryngotracheobronchitis
lymphangioendotheliomata
mediastinopericarditides
pancreaticoenterostomies
pancreaticogastrostomies
pancreaticojejunostomies
pneumoencephalographical
polioencephalomyelitides
pseudohypoparathyroidism
thyroparathyroidectomies

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Wiki User

14y ago
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Wiki User

14y ago

The longest English word is pneumonoultramicroscopicsilicovolcanoconiosis, and it is the name of a disease of the lungs caused by the inflamation of silica dust (like from volcanos) which causes inflammation in the lungs.

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Wiki User

15y ago

The longest official word in the English language, floccinaucinihilipilification, means the act of estimating as worthless. The word has 29 characters.

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Wiki User

14y ago

the longest word in the dictionary is :

antidisestablishmentarianisam.

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Wiki User

14y ago

The world's longest English word is a lung disease cause by inhaling sulfuric dust.

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Anonymous

Lvl 1
3y ago

I know pneumonoultramicroscopicsilicovolcanoconiosis and aequeosalinocalcalinoceraceoaluminosocupreovitriolic. The last one is longer and not as common.

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Q: What is the longest word and What is its definition?
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Word with the longest definition in the English dictionary?

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The longest word in the English Language is Pneumonoultramicroscophicsilicovolcanoconiosis


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