gəˈmādēˌän, gaˈ-, -madē-, -ēən noun
also gam·mat·i·on -mad.ē-
( plural gamma·dia also gammat·ia -ēə)
Etymology: modification of Medieval Latin gammadium, irregular from Late Latin gamma
: a cross formed of four capital gammas especially in the figure of a swastika or in that of a voided Greek cross — called also crux gammata, gammate cross