13-Letter Words Matching _________TR__

There are 31 13-letter words that match _________TR__. 4 are common words, such as AMPHITHEATRES and HYDROELECTRIC. A rarer one is VISCOSIMETRIC. In this set, E is the most frequent open letter (31 words). 4 words contain a doubled letter.

Full list 31

Common words

amphitheatreshydroelectricphotoelectrictrigonometricantisymmetricferroelectricgalvanometricinterlocutrixmonosymmetricnonparametricphallocentricphotoelectron
amphitheatreshydroelectricphotoelectrictrigonometricantisymmetricferroelectricgalvanometricinterlocutrixmonosymmetricnonparametricphallocentricphotoelectronpiezoelectricpneumogastricspectrometricamphitheatricbiotelemetriccephalometricdensitometricinterelectronmagnetometricmultispectralnephelometricpsychrometricrespirometricselenocentricsensitometrictriboelectricturbidimetricturboelectricviscosimetric

About this list

Words
31 (4 common words)
Common example
amphitheatres
Rare example
viscosimetric
Doubled letters
4
Ending in S
1
Most frequent letter
E (31)

Questions

How many 13-letter words matching _________tr__ are there?

31. 4 of them are common words.

What is a common example?

AMPHITHEATRES is among the common words in this set.