The spelling of the word "geimer" is determined by its pronunciation, which is [ˈɡeɪmər]. The IPA phonetic transcription breaks down the word into its individual sounds: /ɡ/ for the "g" sound, /eɪ/ for the long "a" sound, /m/ for the "m" sound, and /ər/ for the schwa and "r" sounds combined. When pronounced correctly, the word should sound like "gay-mer," which refers to a person who enjoys playing video games. The spelling of the word is important to accurately convey its meaning in written communication.