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Webster's 1913 Dictionary

SULCUS

Sul "cus, n.; pl. Sulci. Etym: [L., a furrow. ]

 

Defn: A furrow; a groove; a fissure.

 

New American Oxford Dictionary

sulcus

sul cus |ˈsəlkəs ˈsəlkəs | ▶noun ( pl. sulci |ˈsəlˌsī, -ˌsē | ) Anatomy a groove or furrow, esp. one on the surface of the brain. ORIGIN mid 17th cent.: from Latin, ‘furrow, wrinkle. ’

 

Oxford Dictionary

sulcus

sulcus |ˈsʌlkəs | ▶noun ( pl. sulci |-sʌɪ | ) Anatomy a groove or furrow, especially one on the surface of the brain. ORIGIN mid 17th cent.: from Latin, ‘furrow, wrinkle ’.