1. secondary or accessory; not direct or immediate.
2. a side branch, as of a blood vessel or nerve.
3. security for a loan.
- c. circulation — see collateral vessel.
- c. fissure — a longitudinal fissure of the cerebral hemisphere between the fusiform and parahippocampal gyri. Called also collateral sulcus.
- c. ligaments — see ligament.
- c. recruitment — the utilization of many small arterial–capillary units in pulmonary tissue during exercise and increased cardiac output, for increased exchange of gases.
- c. relationship — where two individuals have a common ancestor.
- c. sulcus — see collateral fissure.
