Definitions

1. noun

A groove or channel, especially one in the surface of an organ or a part of the body.

“The doctor examined the brain’s sulcus to diagnose the patient’s condition.”

2. noun

A narrow valley or a depression in the earth’s surface.

“The village was nestled in a deep sulcus between two mountains.”

3. noun

In botany, the groove or furrow on a seed or a fruit.

“The sulcus on the seed helped the plant to sprout properly.”