ATOMIC NUMBER 20

 Dictionary entry overview: What does atomic number 20 mean? 

• ATOMIC NUMBER 20 (noun)
  The noun ATOMIC NUMBER 20 has 1 sense:

1. a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals

  Familiarity information: ATOMIC NUMBER 20 used as a noun is very rare.

 Dictionary entry details 

• ATOMIC NUMBER 20 (noun)

Sense 1

Meaning:

A white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals

Classified under:

Nouns denoting substances

Synonyms:

atomic number 20; Ca; calcium

Hypernyms ("atomic number 20" 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.)

Hyponyms (each of the following is a kind of "atomic number 20"):

calcium ion; factor IV (ion of calcium; a factor in the clotting of blood)

Holonyms ("atomic number 20" is a substance of...):

fluor; fluorite; fluorspar (a soft mineral (calcium fluoride) that is fluorescent in ultraviolet light; chief source of fluorine)

gypsum (a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris))

burnt lime; calcined lime; calcium oxide; calx; fluxing lime; lime; quicklime; unslaked lime (a white crystalline oxide used in the production of calcium hydroxide)

limestone (a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals)

 Context examples 

An element with atomic symbol Ca, atomic number 20, and atomic weight 40.08.

(Calcium, NCI Thesaurus)