Is “Tachyphylaxis” a Scrabble word?
Yes
TACHYPHYLAXIS
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 Tachyphylaxis
noun
1.A rapidly decreasing response to a drug following administration of the initial doses.