(anatomy) A small constriction in the myelin sheath of axons

plural of node of Ranvier

Abbreviation of sinoatrial node.

(astronomy) The intersection of an orbiting object's orbital plane with the plane of reference.

(botany) Alternative form of leaf node

(botany) One of the spots upon a stem where buds and intercalary meristems occur, usually marking the end of a season's growth. / (computing theory) A node, in a tree, that has no children.

(anatomy) The retropharyngeal lymph node found at the base of the fossa of Rosenmüller.

(anatomy) A lymph node in the left supraclavicular fossa that may indicate cancer in the abdomen if it is hard and enlarged.

plural of leaf node

plural of line of nodes