A misspelling or archaic variant of 'circuit,' meaning a closed path or loop.
This appears to be either a historical variant or common misspelling of circuit, which comes from Latin circuitus (a going around, from circum- and ire meaning to go).
Though 'circut' is not standard modern English, historical documents show people have misspelled 'circuit' in consistent ways for centuries—suggesting our brains naturally try to simplify unusual letter combinations.
Complete word intelligence in one call. Free tier — 50 lookups/day.