terminus

noun (plural termini /-nī/ or terminuses)

• 1a final point in space or time; an end or extremity:the exhibition’s terminus is 1962
• Biochemistry the end of a polypeptide or polynucleotide chain or similar long molecule.

• 2chiefly British the end of a railroad or other transportation route, or a station at such a point; a terminal.
• an oil or gas terminal.

• 3 Architecture a figure of a human bust or an animal ending in a square pillar from which it appears to spring, originally used as a boundary marker in ancient Rome.