(botany) Alternative form of leaf node

(anatomy) Abbreviation of sinoatrial node.

Alternative form of antinode

(astronomy) The point in an orbit at which a body passes the ecliptic plane going north.

(astronomy) The point in an orbit at which a body passes the ecliptic plane going south.

(medicine) a small structure in the heart, located in the Koch's triangle, near the coronary sinus on the interatrial septum

(oceanography) A region of the ocean which experiences little to no tidal fluctuation.

(anatomy, immunology) Synonym of lymph node.

(anatomy, immunology) Each of the small oval bodies of the lymphatic system, distributed along the lymphatic vessels, that are clustered in the armpits, groin, neck, chest and abdomen. They act as filters, with an internal honeycomb of connective tissue filled with lymphocytes and macrophages that collect and destroy bacteria, viruses and foreign matter from lymph. When the body is fighting an infection, these lymphocytes multiply rapidly and produce a characteristic swelling of the lymph nodes.

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