Is “Thesauri” a Scrabble word?
Yes
THESAURI
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 Thesauri
noun
1.A publication, usually in the form of a book, that provides synonyms (and sometimes antonyms) for the words of a given language.
“"Roget" is the leading brand name for a print English thesaurus that lists words under general concepts rather than just close synonyms.”
2.A dictionary or encyclopedia.
3.A hierarchy of subject headings — canonic titles of themes and topics, the titles serving as search keys.
Synonyms: synonymicon