silicon

noun

sil·​i·​con ˈsi-li-kən  ˈsi-lə-ˌkän 

: a tetravalent nonmetallic element with atomic number 14 that occurs combined as the most abundant element next to oxygen in the earth's crust and is used especially in semiconductors, in ferrosilicon for steelmaking, and in other alloys

—often used before another noun

silicon chips

silicon carbide

see Chemical Elements Table

Examples of silicon in a Sentence

Recent Examples on the Web

At the material level, silicon anodes are about five to seven times better. —Alan Ohnsman, Forbes.com, 21 Apr. 2025

The bottom line: Betting against the dropping costs of lithium-ion batteries — similar to silicon solar panels — isn't a good idea. —Katie Fehrenbacher, Axios, 7 Apr. 2025

This would allow for easier production and could enable the integration of silicon support chips. —John Timmer, ArsTechnica, 2 Apr. 2025

Back in the lab, Sinno returns the silicon wafer to its box and moves to another part of the room, gesturing at the various stages of the design process for chips that might—potentially very soon—help summon powerful new AIs into existence. —Billy Perrigo, Time, 2 Apr. 2025

Word History

Etymology

New Latin silica + English -on (as in carbon)

First Known Use

1814, in the meaning defined above

Phrases Containing silicon

• silicon carbide
• silicon dioxide
• silicon nitride

Kids Definition

silicon

noun

sil·​i·​con ˈsil-i-kən 

ˈsil-ə-ˌkän

: a nonmetallic element that occurs combined as the most abundant element after oxygen in the earth's crust and is used especially in alloys and electronic devices see element

Medical Definition

silicon

noun

sil·​i·​con ˈsil-i-kən  ˈsil-ə-ˌkän 

: a tetravalent nonmetallic element that occurs combined as the most abundant element next to oxygen in the earth's crust and is used especially in alloys

—symbol Si see Chemical Elements Table