| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| a chattering or flighty, light-headed person. |
tolerance tol·er·ance (tŏl'ər-əns)
n.
Decreased responsiveness to a stimulus, especially over a period of continued exposure.
The capacity to absorb a drug continuously or in large doses without adverse effect; diminution in the response to a drug after prolonged use.
Physiological resistance to a poison.
Acceptance of a tissue graft or transplant without immunological rejection.
Unresponsiveness to an antigen that normally produces an immunological reaction.
The ability of an organism to resist or survive infection by a parasitic or pathogenic organism.