specimen

Từ điển American Heritage Dictionary 4th

spec·i·men (spĕsʹə-mən)n.
1. An individual, item, or part representative of a class, genus, or whole. See Synonyms at example.
2. A sample, as of tissue, blood, or urine, used for analysis and diagnosis.
3. Informal. An individual; a person:
a disagreeable specimen. [Latin, example, from specere, to look at. See spek- in Indo-European Roots.]