Is “Certiorari” a Scrabble word?
Yes
CERTIORARI
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Certiorari
/ˌsɜːʃəˈɹɑːɹi/
noun
1.A grant of the right of an appeal to be heard by an appellate court where that court has discretion to choose which appeals it will hear.
2.A grant of review of a government action by a court with discretion to make such a review.