pha·ce·lia \fəˈsēlēə\noun Etymology: New Latin, from Greek phakelos bundle, faggot + New Latin -ia 1.capitalized: a genus of American herbs (family Hydrophyllaceae) with usually pinnatifid or dissected leaves and blue, purple, or white flowers in scorpioid cymes — see california bluebell 2.-s: any plant of the genus Phacelia