The spelling of the word "arsinine" is based on the pronunciation of its constituent sounds. IPA phonetic transcription shows that the initial sound "ar" denotes the vowel sound /ɑː/. The following "si" sound combines the consonant sounds /s/ and /ɪ/. The final "nine" sound represents the vowel sound /aɪ/ and consonant sound /n/. The combination of these sounds creates the word "arsinine," which is a chemical compound used as an insecticide. It is important to understand pronunciation and spelling to communicate effectively.