The word "Coelectron" is spelled with a "c" followed by "oe" because it is derived from the Greek word "koinos," meaning common. The "c" is pronounced with a hard "k" sound, and the "oe" together make a "oi" sound, similar to the "oy" sound in the word "boy." The rest of the word follows typical English spelling rules. Coelectron refers to a shared electron in a covalent bond, a commonly used concept in chemistry.