Most of those words are merely inventions and when they occur it is almost always as examples of long words, rather than as genuine examples of use.
For example, the medieval Latin word honorificabilitudinitas (honourableness) was listed by some old dictionaries in the English form honorificabilitudinity (22 letters), but it has never really been in use.
In Voltaire's Candide, Pangloss is supposed to have given lectures on metaphysico-theologo-cosmonigology (34 letters). In Thomas Love Peacock's satirical novel Headlong Hall (1816) there appear two high-flown nonce words (one-off coinages) which describe the human body by stringing together adjectives describing its various tissues. The first is based on Greek words and the second on the Latin equivalents.
They are osteosarchaematosplanchnochondroneuromuelous (44 letters) and osseocarnisanguineoviscericartilaginonervomedullary (51 letters) which translate roughly as of bone, flesh, blood, organs, gristle, nerve and marrow.
Some editions of the Guinness Book of Records mention praetertranssubstantiationalistically (37 letters) used in Mark McShane's Untimely Ripped (1963) and aequeosalinocalcalinoceraceoaluminosocupreovitriolic (52 letters) attributed to Dr Edward Strother (1675-1737).
The formal names of chemical compounds are almost unlimited in length (for example, aminoheptafluorocyclotetraphosphonitrile - 40 letters), but longer ones tend to be sprinkled with numerals, Roman and Greek letters and other arcane symbols. Dictionary writers tend to regard such names as verbal formulae rather than as English words.
Reading this list is a great fun, while expanding your vocabulary at the same time. It is meant to help to improve the vocabulary of the visitors, the students (who are preparing for various examinations), the authors, journalists, literati and all other people who are interested in improving their language skills.
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COURTESY : The Hindu (The National News-Paper) - India