hodo-, hod-, od-

Of or relating to an electron-collecting electrode of an electron tube: "In a battery or other source of direct electric current, the anodal terminal is negative ; while in a passive load, the anodal terminal is positive."

"In an electron tube, electrons from the cathode travel across the tube toward the anodal position; in an electroplating cell, negative ions are deposited at the anodal terminal."

1. A positively charged electrode; such as, an electrolytic cell, storage battery, or electron tube: "The anode or terminal by which the current enters an electrolytic cell, voltaic cell, battery, etc."
2. Etymology: coined from Greek anodos, "way up", from ana, "up" + hodos, "way". Proposed by William Whewell and published by English chemist and physicist Michael Faraday (1791-1867). So called from the path the electrical current was thought to take.

William Whewell, May 24, 1794–March 6, 1866; was an English polymath, scientist, Anglican priest, philosopher, theologian, and historian of science.

To coat a metal, for example, aluminum or magnesium, with a decorative oxide protective film, or by making the metal the anode of an electrolytic cell: The handles of the knives Sally had had been anodized, producing a wonderful blue color.

1. The path by which an electric current leaves the electrolyte and passes into the negative pole.
2. The point or surface in contact with the negative pole; in electro-metallurgy the object to be electro-plated.
3. A negatively charged electrode, as of an electrolytic cell, a storage battery, or an electron tube.
4. The positively charged terminal of a primary cell or a storage battery that is supplying current.
5. Etymology: from Greek kathodos, "descent" (kat-, kata-, cata-) + hodos, "way, path".

1. A reference to the negative electrode from which electrons are emitted: "The cathodic electron is the opposite of the anode or positive pole."
2. Referring to the procedure of an outwardly or efferently application of a nerve impulse from a nerve center: "The cathodic nerve carries impulses from the brain to various parts of the body."

A reference to the coating of a metal; especially, magnesium or aluminum, with a protective film by chemical or electrolytic means.

1. An electronic device that restricts current flow chiefly to one direction.
2. An electron tube having a cathode and an anode.
3. A two-terminal semiconductor device used chiefly as a rectifier.

1. A solid electric conductor through which an electric current enters or leaves an electrolytic cell or other medium.
2. A collector or emitter of electric charge or of electric-charge carriers, as in a semiconducting device.
3. A conducting element that performs one or more of the functions of emitting, collecting, or controlling the movements of electrons or ions in an electron tube, or the movements of electrons or holes in a semiconductor device.
4. A medium for conducting an electrical current from the body to physiological monitoring equipment.
5. A terminal or surface at which electricity passes from one material or medium to another, as at the electrodes of a battery or electrolytic capacitor.
6. One of the terminals of metal, salts, or electrolytes through which electricity is applied to, or taken from, the body or an electric device or instrument.
7. An electronically conductive structure that provides for an electrochemical reaction through the change of oxidation state of a substance.

It may contain or support the reactant or act as the site for the reaction. The anode and cathode of an electric cell are electrodes.

1. An incident or event that is part of a progression or a larger sequence
2. One of a series of related events in the course of a continuous account.
3. A portion of a narrative that relates an event or a series of connected events and forms a coherent story in itself; an incident; such as, an episode in a autobiography.
4. A separate part of a serialized work; such as, a novel or play.
5. A separate program that is part of a television or radio series.
6. A section of a classic Greek tragedy that occurs between two choric songs.
7. In music, a passage between statements of a main subject or theme, as in a rondo or fugue.

1. Relating to or resembling an episode.
2. Divided into or composed of closely connected but independent sections.
3. Sporadic or happening at irregular intervals: "She kept having episodic pain in her lower back."
4. Of a limited duration: "There were episodic wind squalls during the storm."

An instrument that records the movements of locomotion.

1. The scientific study of tracts or pathways in the central nervous system.
2. The study of pathways: in brain physiology, it is the study of the interconnections of brain cells; in philosophy, it is the study of interconnected ideas; in geography, it is the study of paths.

1. An abnormal desire to travel.
2. An excessive compulsion to be traveling.

A device for measuring and displaying the distance traveled by a wheeled vehicle or a person; for example, the milometer which is incorporated in the speedometer of a car; an odometer.

The measurement of the length of a ship's voyage.