13-Letter Words Matching _____I_____U_

There are 12 13-letter words that match _____I_____U_. 3 are common words, such as CONSCIENTIOUS and PERSPICACIOUS. A rarer one is TUBULIFLOROUS. 2 words contain a doubled letter.

Full list 12

conscientiousperspicacioussanctimoniousarteriovenousarundinaceousboraginaceousbrachiosaurusinefficaciousoverrighteousproteinaceousstrobilaceoustubuliflorous

About this list

Words
12 (3 common words)
Common example
conscientious
Rare example
tubuliflorous
Doubled letters
2
Ending in S
12

Questions

How many 13-letter words matching _____i_____u_ are there?

12. 3 of them are common words.

What is a common example?

CONSCIENTIOUS is among the common words in this set.