contra-, contro-, counter, contre-

(Latin: against, opposed to, opposite, conflicting, different, clashing, unaccommodating)

contraharmonical, contraharmonically
Opposed to or the opposite of harmonical.
contraindicate (verb), contraindicates; contraindicated; contraindicating
1. To suggest the inadvisability of something; for example, a medical treatment: Certain medications are contraindicated during pregnancy because of the danger they can pose for the unborn baby.
2. To make a treatment or procedure unacceptable because of a particular condition or circumstance: Some specific exercises in the fitness studio are contraindicated for people with heart problems.
3. Etymology: from Latin contra, "against" + indicere, "to proclaim" from Latin indicare, "to declare, to dictate".
contraindicated (adjective), more contraindicated, most contraindicated
Characteristic of anything that has been suggested as possibly harmful; such as, a warning against a specific medicine or treatment: Because of Amy's heart condition, the doctor specifically advised her not to take the contraindicated drug.
contraindication (s) (noun), contraindications (pl)
A condition which makes a particular treatment or procedure harmful: For some babies, aspirin is absolutely a contraindication because of the danger that aspirin will cause Reye syndrome which is a sudden, or sometimes fatal, disease of the brain (encephalopathy) and with degeneration of the liver.

Sometimes X-rays in pregnancy are relatively contraindicated, because of concern for the developing fetus; unless the X-rays are absolutely necessary.

contraindicative (adjective), more contraindicative, most contraindicative
A reference to the inadvisability of having certain medical treatments: Some patients have contraindicative conditions that can make it much more risky and unwise for doctors to pursue certain types of treatments.
contralateral
contralto (s) (noun); contraltos, contralti (pl)
In music, the lowest female voice or voice part which is higher than a tenor and lower than a soprano: "Although the terms contralto and alto refer to a similar musical pitch or level among singers, the term contralto applies to female singers while the equivalent male format is counter-tenor."
contranatant (adjective), more contranatant, most contranatant
Descriptive of swimming or moving against the current of rivers or streams: The migrations of fishes are examples of contranatant activities.
contranym, contronym (s) (noun); contranyms, contronyms (pl)
1. Any word which can be its own counter application.
2. A word that generates two opposite meanings.

More popularly, they are known as Janus-faced words because the Greek god Janus had two faces which looked in opposite directions.

"The moon is visible tonight."
"The lights in the old house are always invisible."

Although the two italicized words are opposite in meaning, both can be replaced by the same word out. When the moon or sun or stars are out, they are visible; and when the lights are out, they are invisible; therefore, out is considered a contronym.

—"Naming the nyms", by Richard Lederer (from http://wordsmith.org/awad; December 14, 2001).

An additional example includes: "cleave", meaning "adhere" and "separate".

contrapose
contraposition (s) (noun), contrapositions (pl)
1. Placing over against or in an opposite position: Christopher, the composer, wrote some music for the bassoon to be in contraposition to the part for the flute.
2. An opposition, a contrast, or antithesis: Attorney Younge's argument for the ongoing imprisonment of the youth was in contraposition to that of the judge in the court.
contraption (kuhn-TRAP-shuhn) (s) (noun), contraptions (pl)
A machine, an appliance, or an apparatus that appears to be strange or unnecessarily complicated, and often badly made or unsafe: The contraption the couple rode on up to the third floor resembled an elevator; however, it rumbled and sounded very rusty and they felt as if it would break down any minute!
A mechanical contrivance.
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contraremonstrance
Contraria contrariis curantur.
Opposites are cured by opposites.

A medical belief of allopathic medicine, the traditional form of medical practice, that seeks to fight disease by using remedies which produce effects opposite to the effects produced by the disease under treatment; for example, the use of antibiotics.

Similia similibus curantur, "Fight fire with fire" is a contrary approach to healing. See this maxim for more details.

contrariety