especimen

Especimen refers to a single sample or example selected for study, analysis, or display. In scientific and academic contexts, specimens may be biological, geological, or material objects; in medicine, clinical specimens such as blood, urine, or tissue samples are analyzed to diagnose disease or monitor treatment. In museums and research collections, a specimen is preserved to document and study biodiversity, geology, or cultural artifacts.

The word derives from Latin specimen, meaning "a thing to be looked at." In English the standard spelling is specimen. Especimen is typically a transliteration, a variant in other languages, or an error in English; formal English usage generally avoids especimen except citation of non-English terms.

Common types include biological specimens (plants, animals, tissues), taxonomic type specimens (holotype, paratype) that define the name of a species, fossil specimens, mineral and rock specimens. Preservation methods vary: drying and pinning for insects; fixation in formalin or preservation in ethanol for tissues; refrigeration or cryopreservation for some samples.

Use and ethics: Specimen collection and handling follow ethical guidelines and legal permits; proper labeling, databasing, and curation are essential to maintain provenance and reproducibility.

Digitization and repositories: Many institutions maintain catalogs and publish specimen data online; digitization enables broader access and comparative study.