13-Letter Words Matching ____O______I_

There are 76 13-letter words that match ____O______I_. 11 are common words, such as AMNIOCENTESIS and CUSTODIANSHIP. A rarer one is VISCOSIMETRIC. In this set, C is the most frequent open letter (62 words). 7 words contain a doubled letter.

Full list 76

Common words

amniocentesiscustodianshipferromagnetichydroelectricnationalisticnitroglycerinphotoelectricpoliomyelitisrationalisticsocioeconomictrigonometricanisometropia
amniocentesiscustodianshipferromagnetichydroelectricnationalisticnitroglycerinphotoelectricpoliomyelitisrationalisticsocioeconomictrigonometricanisometropiacosponsorshipcyanobacteriacycloparaffinferroelectricflavopurpurinhydrocarbonichydrocephalichydromagnetichypnoanalysislandownershipleptospirosismacrocephalicmacroeconomicmicroanalysismicrocephalicmicroeconomicnarcoanalysisnitrobacterianitroparaffinoligopolisticorthocephalicosteomyelitispaleontologicpathoneurosispiezoelectricpoliomyeliticsalmonellosisspirochetosisunproblematicaminoaciduriaanisometropiccycloolefinicethnohistoricgranodioriticiontophoresisiontophoreticlactoglobulinmacroglobulinmicroanalyticmicrobiologicmicroclimaticmyelofibrosismyelofibroticneuroanatomicpaleobiologicpaleoecologicpaleomagneticpathognomonicpersonalisticphotobiologicphotogeologicphotoperiodicphycoerythrinproconsulshipprotohistoricradiobiologicradioisotopicregionalisticsporopolleninsteroidogenicthyroglobulintriboelectricturboelectricviscosimetric

About this list

Words
76 (11 common words)
Common example
amniocentesis
Rare example
viscosimetric
Doubled letters
7
Ending in S
12
Most frequent letter
C (62)

Questions

How many 13-letter words matching ____o______i_ are there?

76. 11 of them are common words.

What is a common example?

AMNIOCENTESIS is among the common words in this set.