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Children's Dictionary
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speculate to make guesses or wonder about something (often followed by "on" or "about"). [2 definitions]
sped a past tense and past participle of "speed."
speech the power to speak, or the act of speaking. [5 definitions]
speed the act of moving rapidly or swiftly. [5 definitions]
speed limit the highest legal driving speed in a state or region, or on a particular road or portion of a road.
speedometer a instrument that measures the speed of a moving vehicle.
spell1 to name or write the letters of in order. [3 definitions]
spell2 a word or group of words used to work magic. [3 definitions]
spell3 a short period of time. [4 definitions]
spellbound held in attention as if by a spell; amazed; fascinated.
speller a person who spells words. [2 definitions]
spelling the way one or more words are spelled. [2 definitions]
spell out to explain in detail so that no part is difficult to understand.
spend to pay out. [3 definitions]
spent the past tense and past participle of "spend."
sperm1 a cell made by male animals. These cells fertilize the eggs made by a female, so that the animal can reproduce.
sperm whale a very large mammal that lives in the ocean. Sperm whales dive very deeply and can hold their breath for over an hour. They are related to porpoises, dolphins, and other whales with teeth. Sperm whales are the largest toothed whale.
spew to spurt out; vomit. [3 definitions]
sphere a round, solid figure in which every point on the surface is an equal distance from the center. [2 definitions]
sphinx a creature in Egyptian mythology that has a lion's body and the head of a human or animal. [2 definitions]
spice a vegetable substance with a particular smell or taste. Spices are used to flavor food and drink. [4 definitions]