Vacuum activity
noun
1.
(ethology) instinctive behaviour occurring in the absence of the appropriate stimulus
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noun, Medicine/Medical. 1. menstrual extraction. 2. a method of sampling the contents of the uterus for diagnostic purposes.
- Vacuum-bottle
noun 1. a bottle or flask having a vacuum liner that prevents the escape of heat from hot contents, usually liquids, or the entrance of heat into cold contents; thermos. vacuum bottle A container with a double wall and a partial vacuum in the space between the two walls. Vacuum bottles are used to minimize […]
- Vacuum brake
noun 1. a brake system, used on British and many overseas railways, in which the brake is held off by a vacuum on one side of the brake-operating cylinder. If the vacuum is destroyed by controlled leakage of air or a disruptive emergency, the brake is applied. It is now largely superseded by the Westinghouse […]
- Vacuum-casting
noun 1. the casting of metal within a vacuum.
- Vacuum-cleaner
noun 1. an electrical appliance for cleaning carpets, floors, etc., by suction. vacuum cleaner noun 1. an electrical household appliance used for cleaning floors, carpets, furniture, etc, by suction