Is “Def” a Scrabble word?
Yes
DEF
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 Def
/dɛf/
noun
1.Deficiency in amount or quality; a falling short; lack.
2.A situation wherein, or amount whereby, spending exceeds government revenue.
Synonyms: fiscal deficit, shortfall
noun
1.A statement of the meaning of a word or word group or a sign or symbol (dictionary definitions).
2.(usually with the definite article the) A clear instance conforming to the dictionary or textbook definition.
3.A statement expressing the essential nature of something; formulation