Is “Quantum” a Scrabble word?
Yes
QUANTUM
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 Quantum
[ˈkwɑɾ̃əm]
noun
1.The total amount of something; quantity.
2.The amount or quantity observably present, or available.
3.The smallest possible, and therefore indivisible, unit of a given quantity or quantifiable phenomenon.
adjective
1.Of a change, sudden or discrete, without intermediate stages.
2.Of a change, significant.
3.Involving quanta, quantum mechanics or other aspects of quantum physics.