DYK #26: 'titin' the longest word in English (Chemical compound)

Ever though chemical compounds are hard to pronounce. 'Titin' seems easy  enough..right? Until you know the full form that is!

DYK #7: English is a phunny language...

1. The symbol on the "pound" key (#) is called an octothorpe. 
2. The dot over the letter 'i' is called a tittle or superscript dot. 
3. The word "set" has more definitions than any other word in the English language.
4. There is a word in the English language with only one vowel, which occurs five times: "indivisibility." 
5. The only 15-letter word that can be spelled without repeating a letter is "uncopyrightable"
6. The shortest complete sentence in English is the following. "I am." 
7. The longest English word without a true vowel (a, e, i, o or u) is "rhythm". 
8. The verb "cleave" is the only English word with two synonyms which are antonyms of each other: adhere and separate. 
9. The word "triskaidekaphobia" means "fear of Friday the 13th". It also means "superstition about the number thirteen" in general. 
10. A sentence that contains all 26 letters of the alphabet is called a "pangram".