Medical term:

tonic

[ton´ik]

1. producing and restoring normal tone.

2. characterized by continuous tension.

ton·ic

(ton'ik),

1. In a state of continuous unremitting action; denoting especially a prolonged muscular contraction.

2. Invigorating; increasing physical or mental tone or strength.

3. A remedy purported to restore enfeebled function and promote vigor and a sense of well-being; tonics are qualified, according to the organ or system on which they are presumed to act, as cardiac, digestive, hematic, vascular, nerve, uterine, general, etc.

[G. tonikos, fr. tonos, tone]

Farlex Partner Medical Dictionary © Farlex 2012

tonic

(tŏn′ĭk)

a. An agent, such as a medication, that is supposed to restore or improve health or well-being.

b. A liquid preparation for the scalp or hair.

adj.

1. Restorative or stimulating to health or well-being.

a. Physiology Of, relating to, or producing tone or tonicity in muscles or tissue: a tonic reflex.

b. Medicine Characterized by continuous tension or contraction of muscles: a tonic convulsion or spasm.

ton′i·cal·ly adv.

A generic term for a carbonated beverage—commonly called ‘soda’ or ‘pop’—either artificially sweetened with saccharin or aspartame—average < 5 calories—or glucose, fructose—average 170 calories—purchased in cans or bottles or served from a tap
Adverse effects on health—peer-reviewed data: Carbonation is associated with dental erosion, osteoporosis, increased risk of fractures, and kidney stones; the sweeteners are linked to obesity and increased risk of type 2 diabetes

tonic

Alternative medicine A medicinal preparation, usually of herbal origin–eg, ginseng, used in traditional Chinese and in ayurvedic medicine; tonics are said to be help build vital energy–qi. See Hoxsey tonic. Cf Bitter.

ton·ic

(ton'ik)

1. In a state of continuous unremitting action; denoting especially a muscular contraction.

2. Invigorating; increasing physical or mental tone or strength.

3. A remedy purported to restore enfeebled function and promote vigor and a sense of well-being, qualified, according to the organ or system on which it is presumed to act, as cardiac, digestive, hematic, vascular, nervine, uterine, general, and others.

[G. tonikos, fr. tonos, tone]

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

tonic

1. Of continuous activity.

2. A mythical remedy commonly prescribed by doctors as a PLACEBO.

Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

tonicity

[to-nis´ĭ-te]

the state of tissue tone or tension; in body fluid physiology, the effective osmotic pressure equivalent.

to·nic·i·ty

(tō-nis'i-tē),

1. A state of normal tension of the tissues by virtue of which the parts are kept in shape, alert, and ready to function in response to a suitable stimulus. In the case of muscle, it refers to a state of continuous activity or tension beyond that related to the physical properties; that is, it is active resistance to stretch; in skeletal muscle it is dependent upon the efferent innervation.
See also: isotonicity. Synonym(s): tonus

2. The osmotic pressure or tension of a solution, usually relative to that of blood.
See also: isotonicity.

[G. tonos, tone]

tonicity

(tō-nĭs′ĭ-tē)

n. pl. tonici·ties

1. Normal firmness or functional readiness in body tissues or organs.

2. The sustained partial contraction of resting or relaxed muscles.

to·nic·i·ty

(tō-nis'i-tē)

1. A state of normal tension of the tissues by virtue of which the parts are kept in shape, alert, and ready to function in response to a suitable stimulus. In the case of muscle, it refers to a state of continuous activity or tension beyond that related to the physical properties, i.e., its active resistance to stretch; in skeletal muscle, it is dependent on the efferent innervation.
Synonym(s): tonus.

2. The osmotic pressure or tension of a solution, usually relative to that of blood.
See also: isotonicity

[G. tonos, tone]

solution, hypertonic

A solution with an osmotic pressure greater than that of an isotonic solution. Hypertonic ophthalmic solutions cause some stinging when instilled. Examples: sodium chloride 5%: when applied to an oedematous cornea this solution reduces oedema by drawing water from it; sulfacetamide sodium 30%; glycerol (or glycerin), at a dose of 1-1.5 g/kg body weight given as a solution with water or other liquid, which draws water from the eye into the blood and thereby reduces the intraocular pressure. Syn. hyperosmotic agent. See hyperosmotic agent; osmotic pressure; physiological saline.
hypotonic s. A solution with an osmotic pressure lower than that of an isotonic solution. Hypotonic ophthalmic solutions generally cause less irritation than hypertonic ones. See osmotic pressure.
isotonic s. A solution with an osmotic pressure equal to that on the other side of a semipermeable membrane. Example: sodium chloride 0.9% is considered to be approximately isotonic with the tears. See osmotic pressure; physio-logical saline.

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