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the electrode or terminal by which current enters an electrolytic cell, voltaic cell, battery, etc.
the negative terminal of a voltaic cell or battery.
the positive terminal, electrode, or element of an electron tube or electrolytic cell.
Historical Examples

The current always flows within the cell from anode to the cathode.
Physics Willis Eugene Tower

He applied the current, moving the anode and the cathode slowly.
The Silent Bullet Arthur B. Reeve

On the anode side, purple permanganate ions are seen rising toward the positive electrode.
The Elements of Qualitative Chemical Analysis, vol. 1, parts 1 and 2. Julius Stieglitz

He lifted the anode from the solution now, removed the negative, and held it up.
Spawn of the Comet Harold Thompson Rich

The animal will thus move backward easily and forward with difficulty, and it is thus driven to the anode again.
The Organism as a Whole Jacques Loeb

The anode is inserted into its bulb in a quite similar manner.
On Laboratory Arts Richard Threlfall

The gas at the anode was always oxygen; that at the cathode hydrogen.
Experimental Researches in Electricity, Volume 1 Michael Faraday

I do not think that the formation of a crust upon the anode can be entirely prevented.
On Laboratory Arts Richard Threlfall

The plate where the current goes in, the anode, A (Fig. 247), loses in weight since some of the silver is dissolved.
Physics Willis Eugene Tower

A rod of carbon dipping into the melted salt serves as the anode.
An Elementary Study of Chemistry William McPherson

noun
the positive electrode in an electrolytic cell
Also called (esp US) plate. the positively charged electrode in an electronic valve
the negative terminal of a primary cell Compare cathode
n.

1834, coined from Greek anodos “way up,” from ana “up” (see ana-) + hodos “way” (see cede). Proposed by the Rev. William Whewell (1794-1866), English polymath, and published by English chemist and physicist Michael Faraday (1791-1867). So called from the path the electrical current was thought to take. Related: Anodic.
anode
(ān’ōd’)

The positive electrode in an electrolytic cell, toward which negatively charged particles are attracted. The anode has a positive charge because it is connected to the positively charged end of an external power supply.

The positively charged element of an electrical device, such as a vacuum tube or a diode, to which electrons are attracted.

The negative electrode of a voltaic cell, such as a battery. The anode gets its negative charge from the chemical reaction that happens inside the battery, not from an external source. Compare cathode.