IPA: /ɑːrˈkeɪbæktɪrɪəm/
KK: /ɑrˈkeɪbæktɪrɪəm/
A type of single-celled microorganism that belongs to the domain Archaea, often found in extreme environments.
Scientists discovered a new archaebacterium thriving in the hot springs.
Archaebacterium is formed from "archae-" (from Greek "archaios", meaning ancient) and "bacterium" (from Greek "bakterion", meaning small rod). The term refers to a type of ancient, primitive bacteria that are distinct from other forms of life.
Think of 'ancient' ('archae-') when you remember that 'archaebacterium' refers to a type of ancient bacteria.