Is “Loci” a Scrabble word?
Yes
LOCI
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 Loci
/ˈloʊsaɪ/
noun
1.A place or locality, especially a centre of activity or the scene of a crime.
“The cafeteria was the locus of activity.”
2.The set of all points whose coordinates satisfy a given equation or condition.
“A circle is the locus of points from which the distance to the center is a given value, the radius.”
3.A fixed position on a chromosome that may be occupied by one or more genes.