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Quadrat

A small rectangular plot laid off, as in a forest, range, pasture, or cultivated field, for the study of vegetation or animals. Also called a quadrant.

Quarantine

To isolate for the purpose of preventing the spread of contagious diseases.

Quill

A hollow, sharp spine, made of modified hair, found on the backs of animals such as porcupines, hedgehogs, and echidnas. The hollow shaft of a feather, or a type of feather.