loop

In reference to: 1) a sharp curve or complete bend in a vessel, cord or other cylindrical body 2) a wire, generally of platinum or nichrone, fixed onto a handle at one end, bent into a circle or oval at the other, rendered sterile by a flame, & used to transfer microorganisms

Specific

flow-volume loop loop of Henle (nephronic loop) Meyer-Archambault loop sentinel loop

References

Stedman's Medical Dictionary 27th ed, Williams & Wilkins, Baltimore, 1999