Added 10 October 2026 protocerebrum noun Categories: Obscure Words noun ! Definition from Wiktionary (CC BY-SA). More about protocerebrum at Wordnik → Where our words come from → The anterior part of the arthropod brain. Related Words: protocerebronprotocephaloncephalomeremesocerebrumprosomatritocerebrumprotocoelcephalosomeencephalumepisternumloreprocerite Back to today's word