1. Definition: 1. a timepiece that measures a time interval and signals its end

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1. Definition: 1. (baseball) the successful act of striking a baseball in such a way that the batter reaches base safely

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1. Definition: 1. hard outer covering or case of certain organisms such as arthropods and turtles

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1. Definition: 1. test or examine for the presence of disease or infection; "screen the blood for the HIV virus"

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1. Definition: 1. covering or applying simultaneously to a number of similar items or elements or groups; "an umbrella organization"; "umbrella insurance coverage"

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1. Definition: 1. a precautionary measure warding off impending danger or damage or injury etc.; "he put an ice pack on the injury as a precaution"; "an insurance policy is a good safeguard"; "we let our guard down"

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1. Definition: 1. transparent screen (as of glass) to protect occupants of a vehicle

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1. Definition: 1. remedy that prevents or slows the course of an illness or disease; "the doctor recommended several preventatives"

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