| ASCOGONIUM | • ascogonium n. (Mycology) The spiral female organ of an ascomycetous fungus from which asci are produced. • ASCOGONIUM n. the female reproductive structure of fungi. |
| CARBONIUMS | • carboniums n. Plural of carbonium. • CARBONIUM n. a type of positively charged organic ion. |
| CHARMONIUM | • charmonium n. (Physics) Any meson formed from a charm quark and its antiquark. • CHARMONIUM n. any of various elementary particles consisting of a charm quark and an antiquark. |
| DIAMMONIUM | • diammonium n. (Inorganic chemistry) Two ammonium ions in a compound. |
| DIAZONIUMS | • diazoniums n. Plural of diazonium. • DIAZONIUM n. a group of diazo compounds used in the manufacture of certain dyes. |
| EUPHONIUMS | • euphoniums n. Plural of euphonium. • EUPHONIUM n. a musical instrument like a tuba but with somewhat higher pitch. |
| HARMONIUMS | • harmoniums n. Plural of harmonium. • HARMONIUM n. a keyboard instrument in which reeds are made to vibrate by air from a pedal-operated bellows. |
| HYDRONIUMS | • hydroniums n. Plural of hydronium. • HYDRONIUM n. the hydrated hydrogen ion, H3O+. |
| PERIGONIUM | • perigonium n. (Botany) The sterile parts of a flower; collectively, the sepals and petals (or tepals); the perianth. • perigonium n. (Botany) The modified leaves around the antheridia in a bryophytic plant. • perigonium n. (Dated, zoology) The wall of the sporosac in a hydroid. |
| PLUTONIUMS | • plutoniums n. Plural of plutonium. • PLUTONIUM n. a naturally radioactive, silvery, metallic transuranic element. |
| POLEMONIUM | • polemonium n. Any of the genus Polemonium of gamopetalous perennial herbs. • Polemonium prop.n. A taxonomic genus within the family Polemoniaceae – Jacob’s ladder and related flowering plants. • POLEMONIUM n. a genus of gamopetalous perennial herbs, including the Jacob's ladder and the Greek valerian. |
| PURDONIUMS | • purdoniums n. Plural of purdonium. • PURDONIUM n. a kind of coal-scuttle introduced by a Mr Purdon. |
| STRAMONIUM | • stramonium n. The jimsonweed plant. • stramonium n. A narcotic drug obtained from the dried leaves of this plant. • Stramonium prop.n. (Archaic) A taxonomic genus within the family Solanaceae – possibly only consisting of the species now… |
| SULFONIUMS | • sulfoniums n. Plural of sulfonium. • SULFONIUM n. the positively charged group SH3, its salts or derivatives, also SULPHONIUM. |
| SULPHONIUM | • sulphonium n. Alternative spelling of sulfonium. • SULPHONIUM n. the positively charged group SH3, its salts or derivatives, also SULFONIUM. |
| ZIRCONIUMS | • zirconiums n. Plural of zirconium. • ZIRCONIUM n. a rare element of the carbon-silicon group. |