-ium +

(Greek: a suffix; scientific names; names of metallic elements; a part, lining, or enveloping tissue, region; little; representing a diminutive force)

A suffix found on nouns borrowed from Latin; especially, derivatives of verbs (odium; tedium; colloquium; delirium); deverbal compounds with the initial element denoting the object of the verb (nasturtium); other types of compounds (equilibrium; millennium); and derivatives of personal nouns, often denoting the associated status or office (collegium; consortium; magisterium).

This ending of -ium also occurs in scientific terms on a Latin model; such as, in names of metallic elements (barium; titanium) and as a Latinization of Greek -ion (pericardium).

A small dumb keyboard used by pianists for exercising the fingers.
A loss of balance between different forces or aspects attributable to an unstable situation in which some forces outweigh others; a loss or lack of stability.
Any disturbance of the equilibrium in any physiological system.
Greek > Latin: a trading place, market.

In Roman times, this word had two meanings. It referred to a seaport whose commercial life primarily consisted of maritime trade or it could denote a large building on the waterfront of a port where importers and exporters (businessmen) had their "offices".

It's current meaning is "a store, usually a large store, that offers a wide selection of goods; or a marketplace or center of trade".

equalibrium, equilibrium
1. A physical state or sense of being able to maintain bodily balance.
2. The ability to maintain a mental state of calmness and composure.
3. A situation in which opposing forces or factors balance each other and stability is attained.
4. In a physical sense: The condition of equal balance between opposing forces; that state of a material system in which the forces acting upon the system, or those that are taken into consideration, are so arranged that their resultant at every point is zero.
5. The state of equal balance between powers of any kind; equality of importance or effect among the various parts of any complex unity.
6. The condition of suspense or uncertainty produced by equality with the forces of opposing influences; neutrality of judgment or volition.
7. Etymology: from Latin æquilibrium, from æquus, "equal" + libra, "a balance, scale".
gymnasium (s) (noun); gymnasiums, gymnasia (pl)
1. A large room equipped for physical exercise or training of various kinds; for example, in a school or a private sports club: Some of the physical education at schools takes place in the gymnasium, a large hall that allows many students to be active in sports at the same time.
2. In Europe, primarily in Germany and some other European countries, a secondary school where the students are prepared for advanced education in universities: Almost all of the towns and cities in Germany have a gymnasium, where the students can receive an "Abitur" after successfully completing eight or nine years of education.

The ancient Greeks placed a high value on both physical and mental fitness. Each important city in Greece had a public area set aside in which young men would gather to exercise, compete in sports, and receive training in philosophy, music, and literature.

Living in a warm climate and not wanting to be encumbered in their activities by unnecessary clothing, the Greeks would typically do their exercising without wearing any apparel.

3. Etymology: the term given for the exercise area was gymnasion,; literally, "school for unclothed exercise"; from the Greek verb gymnazein, "to exercise with no clothing"; which is a derivative of the adjective gymnos, "unclothed".

The Greek gymnasion, became the Latin gymnasium, which was used in two distinct senses to mean both "an exercise ground" and "a public school".

—Compiled from Webster's Word Histories;
Merriam-Webster Inc.; Springfield, Massachusetts; 1989; page 208.
Information is located at Chemical Element: helium.
impluvium (s) (noun), impluvia (pl)
A rainwater tank in the atrium of an ancient Roman house: The household maid was told to get water from the impluvium in the middle of the garden for her mistress.
1. Iridium, Ir 192, an artificial radioactive isotope with a half-life of 75 days, used in radiotherapy.
2. A very hard and brittle, exceptionally corrosion-resistant, whitish-yellow metallic element occurring in platinum ores and used principally to harden platinum and in high-temperature materials, electrical contacts, and wear-resistant bearings.
3. Etymology: from 1804, Modern Latin, coined by its discoverer, English chemist Smithson Tennant (1761-1815) from Greek iris, "rainbow"; so called for the varying color of its compounds.

More information is located at Chemical Element: iridium.

Name of an unidentified chemical element.
nosocomium (s) (noun), nosocomia (pl)
A medical facility where people stay when they are sick or injured and need a lot of care from doctors and nurses: When Kermit had a heart attack, he was taken to the local nosocomium by ambulance.

Some people are convinced that there are not enough nosocomia available to take care of all of the men, women, and children with ailments that need medical treatment.

odium (s) (noun), odiums (pl)
A state or condition of being extremely disgusting or contemptible in behavior: There is an odium of hatred by Jane for Manfred because he revealed private information to other people about her.
A loathing in which there is an intense dislike.
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odium medicum
The bitter rivalry among physicians of one speciality as opposed to another field of treatment or medical controversies that result in hatred.
Information is located at Chemical Element: praseodymium .
senium (s) (noun), seniums (pl)
The period of hoary age; especially, the debility of advanced existence; a rarely used term referring to the declining years: Because of the senium of the members of the chess club, the officers were actively recruiting new and younger members.