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Children's Dictionary
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specific pertaining to a particular thing or person and to nothing else of the same kind; particular. [3 definitions]
specimen a part or example used to represent a larger whole. [2 definitions]
speck a small mark or spot. [2 definitions]
spectacle an unusual or splendid sight or public show. [2 definitions]
spectacular of or having to do with a spectacle; splendid; marvelous.
spectator one that watches or observes.
spectrum a band of colors that is formed when light is passed through a prism, or in some other way. The six colors of a spectrum are red, orange, yellow, green, blue, and purple.
speculate to make guesses or wonder about something (often followed by "on" or "about"). [2 definitions]
speech the power to speak, or the act of speaking. [5 definitions]
speed the act of moving rapidly or swiftly. [5 definitions]
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]
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.