ATOMIC NUMBER 5

 I. (noun) 

Sense 1

Meaning:

A trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder

Synonyms:

atomic number 5; B; boron

Classified under:

Nouns denoting substances

Hypernyms ("atomic number 5" is a kind of...):

chemical element; element (any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter)

Holonyms ("atomic number 5" is a substance of...):

borax (an ore of boron consisting of hydrated sodium borate; used as a flux or cleansing agent)

kernite (a light soft mineral consisting of hydrated sodium borate in crystalline form; an important source of boron)

Credits