| AMMONIUMS | • ammoniums n. Plural of ammonium. • AMMONIUM n. the ion NH4+, which occurs in the salts formed by ammonia and in ammonia solutions. |
| CARBONIUM | • carbonium n. (Dated, chemistry, deprecated) Any of several organic cations; carbocation or carbenium. • CARBONIUM n. a type of positively charged organic ion. |
| CORONIUMS | • CORONIUM n. the name given to a hypothetical element in the sun's corona showing spectral lines now known to be due to iron and nickel that have lost large numbers of electrons. |
| DIAZONIUM | • diazonium n. (Organic chemistry) any univalent cation, of general formula R-N2+; diazonium salts are used to manufacture… • DIAZONIUM n. a group of diazo compounds used in the manufacture of certain dyes. |
| EUPHONIUM | • euphonium n. A valved brass instrument with conical tubing similar in appearance to a tuba but of higher pitch; a sax horn. • EUPHONIUM n. a musical instrument like a tuba but with somewhat higher pitch. |
| HARMONIUM | • harmonium n. (Music) A small keyboard instrument that consists of a series of reed pipes, which sound when one of… • HARMONIUM n. a keyboard instrument in which reeds are made to vibrate by air from a pedal-operated bellows. |
| HYDRONIUM | • hydronium n. (Inorganic chemistry) The hydrated hydrogen ion, H3O+. • HYDRONIUM n. the hydrated hydrogen ion, H3O+. |
| LIMONIUMS | • LIMONIUM n. a sea plant with brightly coloured funnel-shaped flowers. |
| MECONIUMS | • meconiums n. Plural of meconium. • MECONIUM n. the first fecal excretion of a newborn child. |
| NIHONIUMS | • NIHONIUM n. a highly radioactive element, of which only a few atoms have ever been produced. |
| OOGONIUMS | • oogoniums n. Plural of oogonium. • OOGONIUM n. a female sexual organ in algae and fungi. |
| OPSONIUMS | • OPSONIUM n. anything eaten with bread as a relish. |
| PEPONIUMS | • peponiums n. Plural of peponium. • PEPONIUM n. a fruit having a fleshy interior and a hard rind, also PEPO, PEPONIDA. |
| PLUTONIUM | • plutonium n. The transuranic chemical element with atomic number 94 and symbol Pu: a silvery-gray fissile radioactive… • plutonium n. (Countable, historical) Alternative form of ploutonion. • PLUTONIUM n. a naturally radioactive, silvery, metallic transuranic element. |
| POLONIUMS | • poloniums n. Plural of polonium. • POLONIUM n. a rare highly radioactive metallic chemical element, present in some uranium ores. |
| PURDONIUM | • purdonium n. A coal scuttle. • PURDONIUM n. a kind of coal-scuttle introduced by a Mr Purdon. |
| SULFONIUM | • sulfonium n. (Inorganic chemistry) the univalent H3S+ cation, derived from sulfane. • sulfonium n. (Organic chemistry) any derivative of this cation in which one or more hydrogen atoms are replaced by… • SULFONIUM n. the positively charged group SH3, its salts or derivatives, also SULPHONIUM. |
| ZIRCONIUM | • zirconium n. A chemical element (symbol Zr) with an atomic number of 40, a strong, lustrous, grey-white transition… • ZIRCONIUM n. a rare element of the carbon-silicon group. |