Top 10 Longest Words in The Oxford

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Rank Word Letters
1. Supercalifragilisticexpialidocious (1964)
Wonderful, from song of this title in the film Mary Poppins. 
34
2. Floccinaucinihilipilification (1741)
The action of habit of estimating as worthless 
29
3. Honorificabilitudinitatibus (1599)
Honourableness 
27
4. Antidisestablishmentarians (1900)
Those opposed to the disestabilishment of the Church of England
26
5. Overintellectualization (1922)
Excessive intellectualization 
23
6. Incircumscriptibleness (1550)
Incapable of being circumscribed 
22
  Omnirepresentativeness (1842)
The quality of being representative of all forms or kinds
22
  Reinstitutionalization (1978)
Institutionalize again
22
9. Undercharacterization (1968)
To depict or play with insufficient characterization or subtlety 
21
10. Lithochromatographic (1843)
Colour printing technique using stone 
20

* Source: Oxford English Dictionary

These are all non-medical terms or names of chemical compounds, which can be much longer in lengths.

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