boron
boron — noun
1. a dark, hard element (symbol B) that exists naturally only in combination with o
a dark, hard element (symbol B) that exists naturally only in combination with other substances and is used to strengthen glass, make detergents, and control reactions inside nuclear reactors
Borosilicate glass, which contains boron, resists high temperatures and is used in laboratory beakers.
boron + borosilicate glass — common compound
Farmers add boron to the soil because many crops need it to grow well.
Tomás read about the discovery of boron in an old chemistry textbook.
The scientist explained that boron is a key ingredient in some heat-resistant glass products.
Nuclear reactors use boron rods, which absorb neutrons and help control the power output.
用法筆記
Uncountable in general use ('boron is added'), but countable in technical contexts referring to different forms or isotopes ('three borons were tested').