barometer - An instrument that is used to measure the air pressure and predict changes in weather., diameter - The distance through the center of a circle or shape from one side to the other., optometry - The profession of examining people's eyes to find out if they need eyeglasses or medical treatments., perimeter - The outside edge of an area or surface ;the total length of lines for that form a shape., symmetry - The quality of something that has two sides or has that are the same or very close in shape size and position.,

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