ATOMIC NUMBER 91

 Dictionary entry overview: What does atomic number 91 mean? 

• ATOMIC NUMBER 91 (noun)
  The noun ATOMIC NUMBER 91 has 1 sense:

1. a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead

  Familiarity information: ATOMIC NUMBER 91 used as a noun is very rare.

 Dictionary entry details 

• ATOMIC NUMBER 91 (noun)

Sense 1

Meaning:

A short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead

Classified under:

Nouns denoting substances

Synonyms:

atomic number 91; Pa; protactinium; protoactinium

Hypernyms ("atomic number 91" is a kind of...):

metal; metallic element (any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.)