Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun atomic_number_5

1 sense of atomic number 5

Sense 1
boron, B, atomic number 5 -- (a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder)
       => 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)