Crossword Clue:

Groups of three

AnswerCrossword Clue
TROIKASGroups of three
TRINESGroups of three
TRIADSGroups of three
TRIUNESGroups of three
TRIOSGroups of three
METISOne of three Canadian aboriginal groups
SETCard game based on matching groups of three
SOMETHINGSFISHY"Hmmmmm ..." [as hinted at by the three groups of black squares in the middle of the grid]
ABOThree blood groups
TERCETSPoets' three-line groups