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
hidroids. 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.