poly·adel·phia \ˌ ̷ ̷ ̷ ̷_əˈdelfēə\noun plural Usage: capitalized Etymology: New Latin, from Greek, possession of many brothers, from polyadelphos with many brothers (from poly- + adelphos brother) + -ia -y in former classifications: a class of plants having stamens united by the filaments into three or more fascicles