Definition of teaspoon
1
: a small spoon that is used especially for eating soft foods and stirring beverages and that holds about one third of a tablespoon
2
: a unit of measure especially in cookery equal to ¹/₆ fluid ounce or ¹/₃ tablespoon (5 milliliters)
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Merriam-Webster unabridged
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Time Traveler for teaspoon
The first known use of teaspoon was in 1686
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