archegonium (plural archegonia)

1. (botany) A multicellular reproductive structure that contains a large, non-motile gamete (egg cell), and within which an embryo will develop.
   • 1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, →ISBN, page 5:

     On fertilization, the archegonia form obyriform calyptrae that are distinctly narrowed at base to form a stalk or peduncle; this does not occur in other Hepaticae.

• (reproductive structure) antheridium

• Italian: archegonio
• Portuguese: arquegónio (Portugal), arquegônio (Brazil)
• Spanish: arquegonio