Webster’s Revised Unabridged Dictionary · 1913
Oögonium
O′ö·go′ni·um, n.; pl. L. Oögonia (#), E. Oögoniums (#). [NL., fr. Gr. ω,ὄν an egg + γόνος offspring.] (Bot.) A special cell in certain cryptogamous plants containing oöspheres, as in the rockweeds (Fucus), and the orders Vaucherieæ and Peronosporeæ.