Pneumonoultramicroscopicsilicovolcanoconiosis- according to the Oxford English Dictionary (OED) - is a word alleged to mean 'a lung disease caused by the inhalation of very fine silica dust, causing inflammation in the lungs'.
Nonmodal is MAYBE the longest word.
lethargic
The longest word starting with E is Electroencephalographically.
There is no 8-letter common word. The longest are 6 letters: opiate, payoff, teapot, and tiptoe.(also a 7-letter archaic term taffety, meaning taffeta)
Bellybuttons would be the longest word I can think of beginning with a 'b' and ending in an 's'.
Nghiên - meaning "inclined". 7 letters. That's the longest one-syllable word in Vietnamese
Biotechnological
Acetylcholinesterase is a 20 letter word. It is a chemical compound.
The longest word in the english language is 189,819 letters long. The word itself is another name for titin, the largest known protein.
subdermatoglyphic
forethoughtfulness
KANGAROO