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Tar -
A thick dark-colored semi-liquid of organic composition obtained by the destructive distillation of organic substances and bituminous minerals, including wood, coal or peat.
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Thallus -
A plant body without true stems, leaves, and roots; characteristic of thallophytes, a class of plants that includes algae, fungi, and lichens.
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Toxicology -
Toxicology
is the study of the adverse effects of chemical and physical agents on living organisms. -
Tuber -
A short, solid, underground stem or root whose primary purposes are food storage and reproduction.