sulcus

views updated May 08 2018

sulcus (pl. sulci) Latin for groove or furrow.
1. A complex region of parallel ridges and furrows on a satellite surface, particularly well developed on Ganymede (e.g. Uruk Sulcus, an area of bright, grooved terrain bordering Galileo Regio).

2. A major, rounded depression on the longitudinal mid-line of a brachiopod (Brachiopoda) shell. It usually occurs in the ventral valve and is usually accompanied by a major, rounded, shell elevation (fold) in the other valve.

3. See DINOPHYCEAE.

4. See POLLEN.

A Dictionary of Earth Sciences AILSA ALLABY and MICHAEL ALLABY

sulcus

views updated May 17 2018

sulcus A furrow or groove. On the surface of a pollen grain, a colpus.

A Dictionary of Ecology MICHAEL ALLABY

sulcus

views updated May 21 2018

sulcus (sul-kŭs) n. (pl. sulci)
1. one of the many clefts or infoldings of the surface of the brain.

2. any of the infoldings of soft tissue in the mouth.

A Dictionary of Nursing