ブラウザの設定でJava Scriptの使用を有効にしてご利用ください。
出典:Wiktionary
inter- + first as a surface analysis that succeeds by way of syntactic reanalysis, although the escape from nonword status is recent and prescriptively arguable; see usage notes.
interfirst (not comparable)
See intersecond > 使用する際の注意点.
interfirst