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Derivatives of the prefixed syllables 'tera-' fall into one of three groups in terms of meaning. One group includes derivatives that mean 'three', which is the meaning of the Greek prefix 'ter-'. A second group includes derivatives that mean 'trillion', which is the meaning of the Greek prefix 'tera-'. For example, the noun terabit refers to one million million binary digits of information. The noun terahertz refers to one trillion hertz. A third group includes derivatives that refer to monsters and monstrosities, which is the meaning of the Greek prefix 'terat-'. For example, the noun teratogen refers to an agent that malforms the foetus in the first three months of pregnancy. The adjective teratoidrefers to someone or something that's abnormally formed. And the noun teratology is the study of malformations and monstrosities.

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15y ago

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