plethor-, plethysmo- +

Equal in quantity.

1. Excess; overabundance; a very large amount or number of something, especially an excess amount.
2. An excess of blood in the circulatory system or in one organ or area; especially in the facial veins, causing a ruddy complexion.
3. Etymology: from about 1541, "excess, superabundance" and a medical word for "excess of body fluid", from Late Latin plethora, from Greek plethore, "fullness" from plethein "to be full".

In our modern times, plethora is more often used in a general, non-medical sense, with the meaning of "excess" or "abundance",

The figurative meaning of "too much, over fullness in any respect" was first recorded in about 1700.

1. Excessive in quantity; overabundant; excessive in style.
2. Overfull; turgid; inflated: "He made a plethoric, pompous speech."
3. Pertaining to, or characterized by plethora.
4. Marked by an excess of blood.
5. By extension, a red florid complexion: sanguine, sanguineous.

A record or tracing produced by a plethysmograph (an instrument for measuring changes in volume of a part, or organ, or whole body; usually, resulting from fluctuations in the amount of blood it contains).

An instrument for determining and registering the variations in the size or volume of a limb; such as, the arm or leg, and therefore the variations in the amount of blood in the limb.

Measuring and recording changes in the volume of the body or of a body part or organ.

Measurement of the fullness of a hollow organ.