11-Letter Words Matching ____A__D___

There are 20 11-letter words that match ____A__D___. 3 are common words, such as TETRAHEDRAL and TETRAHEDRON. A rarer one is TARMACADAMS. 2 words contain a doubled letter.

Full list 20

tetrahedraltetrahedronultramoderncarbamidineenneahedronheptahedronhypoacidityicosahedralicosahedronostracodermpentahedrontarradiddlecotransducehispanidadsnonvaliditypentahedralpentamidinepteranodonssemiariditytarmacadams

About this list

Words
20 (3 common words)
Common example
tetrahedral
Rare example
tarmacadams
Doubled letters
2
Ending in S
3

Questions

How many 11-letter words matching ____a__d___ are there?

20. 3 of them are common words.

What is a common example?

TETRAHEDRAL is among the common words in this set.