水母芽

Medusa \Me*du"sa\, n. [L., fr. Gr. ?.]
1. (Class. Myth.) The Gorgon; or one of the Gorgons whose
hair was changed into serpents, after which all who looked
upon her were turned into stone.

2. [pl. {Medusae}.] (Zo["o]l.) Any free swimming acaleph; a
jellyfish.

Note: The larger medus[ae] belong to the Discophora, and are
sometimes called {covered-eyed medus[ae]}; others,
known as {naked-eyed medus[ae]}, belong to the
Hydroidea, and are usually developed by budding from
hydroids. See {Discophora}, {Hydroidea}, and
{Hydromedusa}.

{Medusa bud} (Zo["o]l.), one of the buds of a hydroid,
destined to develop into a gonophore or medusa. See
{Athecata}, and {Gonotheca}.

{Medusa's head}.
(a) (Zo["o]l.) An astrophyton.
(b) (Astron.) A cluster of stars in the constellation
Perseus. It contains the bright star Algol.