Sample

A portion or piece of a whole. A selected subset of a population or subset of whatever is being studied. For example, in a study of people the sample is a number of people chosen from a larger population [see population]. An environmental sample (for example, a small amount of soil or water) might be collected to measure contamination in the environment at a specific location.

Source: ATSDR Glossary of Terms  

Contaminant(s) - Population

Español: Muestra
Français: Echantillon

Endocrine Disruptors

Dioxins

Climate Change

Tuberculosis

Marine Litter