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gon-, gonio-, -gon, -gonal, -gonally, -gony (Greek: corner, bend, angle).


agonic:
decagon:
diagon:
diagonal:
dodecagon:
enneagon:
goniometer:
goniometry:
hendecagonal:
heptagon:
hexagon:
isogonic:
nonagon:
octagon:
orthogonal:
oxygon:
pentagon:
polygon:
tetragon:
trigon:
trigonometry: