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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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AuthorVinko
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