Is “Tagma” a Scrabble word?
Yes
TAGMA
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 Tagma
/ˈtæɡ.mə/
noun
1.A specialized grouping of arthropodan segments, such as the head, the thorax, and the abdomen with a common function.
2.A military unit of battalion or regiment size, in the Byzantine empire of the 8th - 11th centuries.