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vertebra one of the small bones that form the spinal column.
vertebrate a member of the large group of animals that have a backbone or spinal column, including mammals, birds, amphibians, reptiles, and fishes. [1/3 definitions]
waterspout a funnel-shaped column of whirling spray produced when a tornado or whirlwind touches the surface of a large body of water. [1/2 definitions]
whirlwind a small storm in which a column of air turns rapidly around a central axis as the storm moves forward. Tornadoes are whirlwinds. [1/3 definitions]