schwann

noun

1. The·o·dor [tey-oh-dawr] /ˈteɪ oʊˌdɔr/, 1810–82, German zoologist.

noun

1. Theodor (ˈteːodoːr). 1810–82, German physiologist, who founded the theory that all animals consist of cells or cell products

1. German physiologist and pioneer histologist who described (1839) the cell as the basic structure of animal tissue. He isolated pepsin in 1836, and in 1838 he described the myelin sheath.