Is “Mucus” a Scrabble word?
Yes
MUCUS
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 Mucus
/ˈmjuːkəs/
noun
1.A slippery secretion from the lining of the mucous membranes.