tet·ra·dy·nam·ia \ˌ ̷ ̷ ̷ ̷ˌdīˈnamēə, -_də̇ˈ-, -nām-\noun plural Usage: capitalized Etymology: New Latin, from tetra- + Greek dynamis power + New Latin -ia — more at dynamic in former classifications: a class of higher plants comprising all plants having tetradynamous stamens