|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|
|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
|1.||a. an enclosure or platform, usually surrounded by seats on all sides, in which sports events, contests, entertainments, etc, take place: a boxing arena|
|b. (as modifier): arena stage|
|2.||the central area of an ancient Roman amphitheatre, in which gladiatorial contests and other spectacles were held|
|3.||a sphere or scene of conflict or intense activity: the political arena|
|[C17: from Latin harēna sand, place where sand was strewn for the combats]|
arenan. [common; Unix] The area of memory attached to a process by `brk(2)' and `sbrk(2)' and used by `malloc(3)' as dynamic storage. So named from a `malloc: corrupt arena' message emitted when some early versions detected an impossible value in the free block list. See overrun screw, aliasing bug, memory leak, memory smash, smash the stack.