Main Entry: loop

Pronunciation: \ˈlüp\

Function: noun

1 : a curving or doubling of a line so as to form a closed or partly open curve within itself through which another line can be passed
2 a : something (as an anatomical part) shaped like a loop—see loop of henle; lippes loop b : a surgical electrode in the form of a loop
3 : a fingerprint in which some of the papillary ridges make a single backward turn without any twist

[loop illustration]

4 : a wire usually of platinum bent at one end into a small loop (usually four millimeters in inside diameter) and used in transferring microorganisms