tono-, -tonia, -tone, -tony, -tonic, -tonical (tension) +

Generalized absence of muscle tone; a floppiness of the muscles: "Amyotonias are usually associated with flabby muscles and an increased range of passive movements at the joints."

Lack of muscle tone; specifically (in full amyotonia congenita), any of several rare congenital diseases characterized by general hypotonia of the skeletal muscles.

Also known as vasospasm, the sudden decrease in the internal diameter of a blood vessel that results from contraction of smooth muscle within the wall of the vessel. This causes a decrease in blood flow, but an increase in systemic vascular resistance. Also known as, vasoconstriction.

Known as vasodilatation, it refers to dilatation of the blood vessels, particularly functional increase of the arteriolar lumen.

A lack of physiological firmness of tissues and normal functions of bodily organs: "The atonia of her body was a result of a poor diet and a lack of exercise that caused various muscular disorders; such as, spasms and temporary rigidity of her muscles."

1. Relating to, caused by, characterized by, or exhibiting lack of muscle tone: "Someone who has an atonic body, or a part of of the body, has a weakness or reduction in the normal tone (strength or firmness) of a tissue or some part of the body."

Referring to or having a loss of force or vital energy."

2. A description of a syllable or a sound that is not accented or stressed: "The syllables of the words did not include any atonic vowels."

Relating to, caused by, or exhibiting a lack of normal muscle tone or strength: "A person's atonicity can result in a loss of tension or strength in a muscle, so that it is completely flaccid or floppy."

"Some atonicities take place because of a nervous-system disorder or after an injury to the nerves; for example, the arm muscles may have atonicity resulting from damage to the brachial plexus (nerve roots in the neck that go into the arms)."

1. Lack of tone or energy; muscular weakness; especially, in a contractile organ.
2. Lack of normal muscle tone.
3. Lack of normal tone or tension; flaccidity.

1. A form of insanity, characterized by epilepsy and catalepsy.
2. An abnormal condition often associated with schizophrenia and variously characterized by stupor, stereotypy, mania, and either rigidity or extreme flexibility of the limbs.

Designating or characteristic of a type of personality which is introverted, intellectual, and emotionally restrained.

Prolonged muscle contractions that may cause twisting and repetitive movements or abnormal posture.

These movements may be in the form of rhythmic jerks. The condition may progress in childhood, but it is rare in adults. In children the legs are usually affected first.

1. In ecology, a transition zone between two distinct habitats that contains species from each area, as well as organisms unique to it.
2. In anthropology, such an area of transition in which certain game or vegetation overlap; a region of primary importance for human subsistence.

An ecotone is a transition area between two adjacent ecological communities (ecosystems). It may appear on the ground as a gradual blending of the two communities across a broad area, or it may manifest itself as a sharp boundary line.

Ecotones are particularly significant for mobile animals, as they can exploit more than one set of habitats within a short distance. This can produce an edge effect along the boundary line, with the area displaying a greater than usual diversity of species.

The word was coined from a combination of eco(logy) plus -tone, from Greek tonos or "tension"; in other words, a place where "ecologies are in tension".

1. Increased rigidity, tension, and spasticity of the muscles.
2. The condition (in muscle or muscular tissue) of being hypertonic.
3. A condition of excessive tone of the skeletal muscles; increased resistance of muscle to passive stretching.

1. Having an extreme muscular or arterial tension; spastic.
2. Having a higher osmotic pressure of two solutions.

1. A state of reduced pressure of the intra-ocular fluid.
2. A condition in which there is diminution or loss of muscular tonicity, resulting in the stretching of the muscles beyond their normal limits.
3. A condition of diminished tone of the skeletal muscles, resulting in the diminished resistance of muscles to passive stretching.
4. The condition (in muscle or muscular tissue) of being hypotonic.