noun pl. species -·cies

1. a distinct kind; sort; variety; class a species of bravery
2. Obsolete outward form, appearance, or mental image
3. Obsolete specie
4. Biol. a naturally existing population of similar organisms that usually interbreed only among themselves, and are given a unique, latinized binomial name to distinguish them from all other creatures
5. Logic a class of individuals or objects having certain distinguishing attributes in common, given a common name, and comprised with other similar classes in a more comprehensive grouping called a genus
6. Physics
   1. a specific kind of atomic nucleus
   2. nuclide
7. R.C.Ch.
   1. the totality of natural physical characteristics (appearance, taste, etc.) of bread or wine, these characteristics remaining the same in the consecrated bread or wine of the Eucharist
   2. the consecrated bread or wine of the Eucharist

Etymology: L, a seeing, appearance, shape, kind, or quality < base of specere, to see: see spy