13-Letter Words Matching ________I__U_

There are 13 13-letter words that match ________I__U_. 5 are common words, such as CARTILAGINOUS and MULTITUDINOUS. A rarer one is THERMOPHILOUS. In this set, O is the most frequent open letter (13 words). 3 words contain a doubled letter.

Full list 13

cartilaginousmultitudinousplatitudinouspusillanimousserendipitousentomophilouslactobacillusprotoactiniumnonleguminousplenitudinousrectitudinoussubbituminousthermophilous

About this list

Words
13 (5 common words)
Common example
cartilaginous
Rare example
thermophilous
Doubled letters
3
Ending in S
12
Most frequent letter
O (13)

Questions

How many 13-letter words matching ________i__u_ are there?

13. 5 of them are common words.

What is a common example?

CARTILAGINOUS is among the common words in this set.