Relating to or belonging to the gluteus muscles of the buttocks.
From Latin glutaeus, from Greek gloutos (buttock), plus English adjectival suffix -al. Modern anatomy uses this Latin-Greek term.
The anatomical name for your butt comes from Greek, which means ancient Greek doctors were detailed observers of human anatomy—they needed a word specific enough that it survived into modern medicine rather than being replaced with slang!
Complete word intelligence in one call. Free tier — 50 lookups/day.