Van Al·len belt 
(văn ălən)
(văn ălən)n.
Either of two toroidal zones containing high-energy ionized particles trapped in Earth's magnetic field and surrounding the planet, beginning at an altitude of about 800 kilometers (500 miles) and extending tens of thousands of kilometers into space.
[After James Alfred Van Allen (1914-2006), American physicist.]
- circularize
- circularizer
- circularly
- circular measure
- circular mil
- circular saw
- circulate
- circulating library
- circulation
- circulative
- circulator
- circulatory
- circulatory system
- circum-
- circumambience
- circumambiency
- circumambient
- circumambiently
- circumambulate
- circumambulation
- circumboreal
- circumcise
- circumciser
- circumcision
- circumduction