hypo-, hyp-

(Greek: under, below, beneath; less than; too little; deficient, diminished; used as a prefix)

hypomnesia (s) (noun), hypomnesias (pl)
A person's faulty and unsound memory: Jack suffered from hypomnesia because his powers of recall were totally impaired and defective.
1. A person whose standing height is short in proportion to the sitting height, owing to shortness of limb.
2. A mutant gene that shows only a partial reduction in the activity it influences.
An organ that curves upwards because the ventral surface grows more rapidly.
1. The state of growth in a flattened structure in which the under surface grows more vigorously than the upper side.
2. An upward bending of leaves or other plant parts, resulting from growth of the lower side.

In plant physiology, the state in which more vigorous growth occurs in the lower surface of an organ, such as a young fern frond, causing an upward curvature.

hyponatremia (s) (noun), hyponatremias (pl)
A lower-than-normal level of sodium, or salt, in the blood: "Hyponatremia has sometimes been referred to as water intoxication; especially, when it is caused by an excess consumption of water, as during strenuous exercise and without an adequate replacement of sodium."

"When a person has hyponatremia, there is a loss of sodium which is essential for many body functions including the maintenance of fluid balance, regulation of blood pressure, and normal function of the nervous system; and when it is severe, it can lead to confusion and seizures."

hyponeuston, hyponeustonic
Organisms living immediately below the surface film of a body of water; a component of the neuston.
hyponychium, hyponychial
The thickened epidermis beneath the free distal end (away from the point of attachment) of the claw, or nail, of a digit.

A claw is a pointed curved nail on the end of each toe in birds, some reptiles, and some mammals.

An hemorrhage (bleeding) beneath, or under, a fingernail or toenail.
1. A name made invalid by the lack of adequate contemporary description of the taxon it was intended to designate.
2. A term that denotes a subcategory of a more general class; such as, "chair" and "table" are hyponyms of furniture.

A word that has a more specific meaning than another term; for example, in the relationship between woman and humans, "woman" is a hyponym; in the relationship between cat and animal, "cat" is a hyponym.

Coined in 1963 by John Lyons, hyponym is supposed to describe an important notion which is central to the way we define meanings in terms of lexical structures.

People often construct meanings in terms of a hierarchy of categories, ranging from the generic, technically called the hypernym, literally "the word above"; to a subsidiary or hyponym, literally, "the word below".

"Cat" is a hyponym of animal, although all cats are animals, all animals are not cats. "French" is a hyponym of languages; and "square" is a hyponym of rectangle; also, the words "tulip" and "rose" are hyponyms of flower.

hypopallesthesia (s) (noun), hypopallesthesias (pl)
A decreased sharpness of the sense of vibration: When Dr.Fisher applied a vibrating tuning fork to Trudy’s ankle, she indicated a degree of hypopallesthesia because she didn't feel the vibrations as much as she had in the previous examination.
Reduced delivery of pancreatic digestive enzyme secretions.