12-letter words that end in ium
- ad arbitrium — at pleasure; at will.
- aldebaranium — (chemistry, obsolete) A rejected name for ytterbium.
- amphithecium — the outer layer of cells of the sporophyte of mosses and liverworts that develops into the outer parts of the spore-bearing capsule
- androclinium — clinandrium.
- antebrachium — (anatomy) The forearm.
- antibrachium — (anatomy) alternative spelling of antebrachium.
- appressorium — a flattened hypha of a parasitic fungus that penetrates the host tissues
- archesporium — archespore.
- archipallium — (anatomy) The oldest region of the brain's pallium, often considered contiguous with the olfactory cortex, but varying among species. In humans, the archipallium makes up the hippocampus.
- at a premium — If something is at a premium, it is wanted or needed, but is difficult to get or achieve.
- atmospherium — an optical system used to simulate images of atmospheric phenomena, as cloud formations, storms, and day and night, on the inside of a dome.
- bimillennium — a period of two thousand years
- cladosporium — any of the species of fungi in the genus Cladosporium
- cork cambium — a layer of meristematic cells in the cortex of the stems and roots of woody plants, the outside of which gives rise to cork cells and the inside to secondary cortical cells (phelloderm)
- cuprammonium — an ion of copper oxide used (in solution) in the manufacture of rayon and other man-made fibres
- darmstadtium — a synthetic radioactive element produced in small quantities by cold fusion in a linear accelerator. Symbol: Ds; atomic no: 110
- deinotherium — any member of the genus Deinotherium, consisting of mammals resembling elephants that existed during the Miocene, Pliocene, and Pleistocene epochs
- dolphinarium — An aquarium in which dolphins are kept and trained for public entertainment.
- epithalamium — A song or poem celebrating a marriage.
- ferroniobium — An important alloy of iron and niobium.
- happy medium — a course of action or condition that is between two extremes: Our climate is a happy medium between hot and cold.
- hologonidium — soredium.
- hypogastrium — the lower and median part of the abdomen.
- inhalatorium — a room or building in which vapours are breathed in
- interstitium — (medicine) An interstitial space within a tissue or organ.
- ivy geranium — a trailing geranium, Pelargonium peltatum, of southern Africa, having a fleshy stem that becomes woody with age, glossy, ivy-shaped leaves, and clusters of flowers ranging from white to deep rose in color.
- kurchatovium — (chemistry) A rejected name for rutherfordium.
- leontopodium — any plant of the Eurasian alpine genus Leontopodium, esp L. alpinum
- mare crisium — (Sea of Crises) a dark plain in the first quadrant of the face of the moon: about 66,000 sq. mi. (170,000 sq. km).
- mare imbrium — (Sea of Showers) a dark plain in the second quadrant of the face of the moon: about 340,000 sq. mi. (880,000 sq. km).
- mesogastrium — the mesentery of the embryonic stomach.
- microscopium — a faint constellation in the S hemisphere lying near Sagittarius and Capricornus
- mycocecidium — a gall caused by a parasitic fungus.
- mycodomatium — an abnormal growth on a plant, caused by fungi
- neoytterbium — ytterbium.
- nielsbohrium — dubnium: symbol, Ns: the name originally proposed by Russian scientists for this element
- panhellenium — an institution founded by the Roman Emperor Hadrian idealizing Greece's Classical history
- perichaetium — a leafy cluster (bracts) around the base of the reproductive organs of some plants, predominantly mosses
- perinephrium — the capsule of connective tissue that envelops the kidney.
- periodontium — the bone, connective tissue, and gum surrounding and supporting a tooth.
- perionychium — the epidermis surrounding the base and sides of a fingernail or toenail.
- periselenium — the closest point of the orbit of a spacecraft to the moon
- pleiochasium — a flowering system in which several buds come out at the same time
- postliminium — postliminy.
- praseodymium — a rare-earth, metallic, trivalent element, named from its green salts. Symbol: Pr; atomic weight: 140.91; atomic number: 59; specific gravity: 6.77 at 20°C.
- progymnasium — (in Europe) a school that prepares pupils for secondary education (the gymnasium)
- protactinium — a radioactive, metallic element. Symbol: Pa; atomic number: 91.
- prothalamium — prothalamion.
- pseudopodium — pseudopod.
- quadriennium — quadrennium.
On this page, we collect all 12-letter words ending in IUM. It’s easy to find right word with a certain length. It is the easiest way to find 12-letter word that ends in IUM to use in Scrabble or Crossword puzzles.