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There are 16 words ending with SIUM

CAESIUM	• caesium n. The chemical element (symbol Cs) with an atomic number of 55. It is a soft, gold-colored, highly reactive… • cæsium n. Alternative spelling of caesium. • CAESIUM n. a metallic element.
CESIUM	• cesium n. (American spelling) Alternative form of caesium. • CESIUM n. a metallic element.
DICHASIUM	• dichasium n. (Botany) A cymose inflorescence with all branches below the terminal flower in regular opposite pairs. • DICHASIUM n. a cymose inflorescence in which each axis in turn produces a pair of nearly equal branches.
DYSPROSIUM	• dysprosium n. A metallic chemical element (symbol Dy) with atomic number 66: a rare earth element with a metallic silver lustre. • DYSPROSIUM n. a rare-earth metal used in nuclear research.
EPIMYSIUM	• epimysium n. A layer of connective tissue which surrounds individual muscles. • EPIMYSIUM n. a fibrous sheet enclosing a muscle.
GYMNASIUM	• gymnasium n. (Formal) A large room or building for indoor sports. • gymnasium n. A type of secondary school in some European countries which typically prepares students for university. • gymnasium n. (Historical) A public place or building where Ancient Greek youths took exercise, with running and wrestling…
HASSIUM	• hassium n. An artificially-produced transuranic chemical element (symbol Hs) with atomic number 108. • HASSIUM n. a radioactive element synthetically produced by high-energy ion bombardment.
INDUSIUM	• indusium n. (Botany) A protecting membrane, especially that covering the developing spores of a fern. • INDUSIUM n. an enclosing membrane.
MAGNESIUM	• magnesium n. The chemical element (symbol Mg) with an atomic number of 12. It is a light, easily flammable, silvery-white… • MAGNESIUM n. a bright silver-white metallic element.
MONOCHASIUM	• monochasium n. (Botany) A type of cyme on which each single axis bears one flower. • MONOCHASIUM n. a cyme with a single main stem.
PERIMYSIUM	• perimysium n. (Anatomy) A layer of connective tissue which surrounds several muscle fibers into bundles. • PERIMYSIUM n. the connective tissue which surrounds and binds together muscle fibres.
PLEIOCHASIUM	• pleiochasium n. (Botany) An inflorescence in which several buds come out at the same time. • PLEIOCHASIUM n. a cymose inflorescence in which each branch bears more than two lateral branches.
POLYCHASIUM	• POLYCHASIUM n. a cymose inflorescence in which three or more branches arise from each node.
POTASSIUM	• potassium n. A soft, waxy, silvery reactive metal that is never found unbound in nature; an element (symbol K) with… • potassium n. (Countable) A single atom of this element. • POTASSIUM n. a silvery alkaline metallic element.
PROGYMNASIUM	• progymnasium n. In Germany, a classical school without the higher classes; a school preparatory to a gymnasium. • PROGYMNASIUM n. in Germany, a gymnasium for pupils up to age 16 only, at which university entrance qualifications are not obtainable.
SYMPOSIUM	• symposium n. A conference or other meeting for discussion of a topic, especially one in which the participants make presentations. • symposium n. A drinking party in Ancient Greece, especially one with intellectual discussion. • symposium n. A collection of essays, articles or papers on a particular subject by a number of contributors.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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English Wiktionary: 78 words
Scrabble in French: 9 words
Scrabble in Spanish: no word
Scrabble in Italian: 1 word
Scrabble in German: 7 words
Scrabble in Romanian: no word

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