There are 2 definitions of medusa in English:

medusa1

Syllabification: me·du·sa
Pronunciation: /məˈd(y)o͞osə, -zə
 
 
/

noun (plural medusae /-sē, -sī, -zē, -zī/ or medusas)

Zoology
1A free-swimming sexual form of a coelenterate such as a jellyfish, typically having an umbrella-shaped body with stinging tentacles around the edge. In some species, medusae are a phase in the life cycle that alternates with a polypoid phase. Compare with polyp.
More example sentences
  • A medusa, or jellyfish, is part of the life cycle of just one major group of animals, the cnidarians.
  • Cnidarians have two basic body forms, medusa and polyp.
  • Two major adult body types characterize the phylum: the medusa is typically a mobile pelagic organism, and the polyp is typically a sessile benthic organism.
1.1A jellyfish.
More example sentences
  • In studies with a microscope, Forbes had shown that hydroid jellyfish known as naked-eyed medusae reproduce not only by spewing eggs, but also by asexual budding, which he found marvelous to behold.
  • This specialized tank creates a waterflow that keeps medusae and other delicate animals in constant suspension assuring that their tissues are not destroyed by abrasive contact with aquarium walls.
  • Noteably, all epipelagic, midwater, and deepsea medusae have very simple, reduced, or absent ocelli.

Origin

mid 18th century: named by association with Medusa.

Definition of medusa in:

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Word of the day internecine
Pronunciation: ˌɪntəˈniːsʌɪn
adjective
destructive to both sides in a conflict

There are 2 definitions of medusa in English:

Medusa2

Syllabification: Me·du·sa
Pronunciation: /məˈd(y)o͞osə, -zə
 
 
/
Greek Mythology
The only mortal Gorgon, whom Perseus killed by cutting off her head.

Definition of medusa in:

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Word of the day internecine
Pronunciation: ˌɪntəˈniːsʌɪn
adjective
destructive to both sides in a conflict