The word "selenin" is spelled with four letters and is pronounced as /sɛlɛnin/. The IPA phonetic transcription of this word indicates that it starts with the "s" sound, followed by the "ɛ" vowel sound, then the "l" sound is repeated twice, and finally the "n" sound is added at the end. Though it is not a commonly used word in English, it refers to a chemical compound derived from the element selenium.
An antiserum prepared by Klebs from cultures of Diplococcus semilunaris, employed in the treatment of the mixed infection in tuberculosis.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.