Is “Decad” a Scrabble word?
Yes
DECAD
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 Decad
/ˈdɛkæd/
noun
1.A group, set, or series of ten , particularly:
“a decade of soldiers”
2.A set of resistors, capacitors, etc. connected so as to provide even increments between one and ten times a base electrical resistance.
3.The interval between any two quantities having a ratio of 10 to 1.
“There are decades between 1.8 and 18, between 25 and 250 and between 0.03 and 0.003.”