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Hadron
Any of over 100 elementary particles that are the building blocks of atomic particles such as protons an (more...)

Hadrosaurus
An American herbivorous dinosaur of great size, allied to the iguanodon. It is found in the Cretace (more...)

Hadrurus
A genus of scorpions found in the southwestern U.S., characterised by numerous setae on the stinger; the commonest speci (more...)

Haeckel, Ernst
German naturalist, 1834-1919.

Haeckel's Gastrea Theory
That the two-layered gastrula is the ancestral form of all multicellular animals.

Recapitulation Theory
The theory formulated by E.H. Haeckel that individuals in their embryonic development pass through stages similar in gen (more...)

Haem
1. Compounds of iron complexed in a porphyrin (tetrapyrrole) ring that differ in side chain composi (more...)

Haem A
A derivative of haem found in cytochrome aa3.

Haemachrome
Hematin.

Haemachrosis
An intensified redness of the blood.

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