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Definition:
extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian
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- heuristic program (Definition: a commonsense rule (or set of rules) intended to increase the probability of solving some problem)
- hi (Definition: an expression of greeting)
- heterostracan
- hibiscus tiliaceus (Definition: shrubby tree widely distributed along tropical shores; yields a light tough wood used for canoe outriggers and a fiber used for cordage and caulk; often cultivated for ornament)
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