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Fluorine :: Fluorine (n.) A non-metallic, gaseous element, strongly acid or negative, or associated with chlorine, bromine, and iodine, in the halogen group of which it is the first member. It always occurs combined, is very active chemically, and possesses such an avidity for most elements, and silicon especially, that it can neither be prepared nor kept in glass vessels. If set free it immediately attacks the containing material, so that it was not isolated until 1886. It is a pungent, corrosive, colorles

Discoblastic :: Discoblastic (a.) Applied to a form of egg cleavage seen in osseous fishes, which occurs only in a small disk that separates from the rest of the egg..

Itacolumite :: Itacolumite (n.) A laminated, granular, siliceous rocks, often occurring in regions where the diamond is found..

Noon :: Noon (a.) Belonging to midday; occurring at midday; meridional.

Bimonthly :: Bimonthly (a.) Occurring, done, or coming, once in two months; as, bimonthly visits; bimonthly publications..

Wallerian Degeneration :: Wallerian degeneration () A form of degeneration occurring in nerve fibers as a result of their division; -- so called from Dr. Waller, who published an account of it in 1850..

Metaleptic :: Metaleptic (a.) Of, pertaining to, concerned in, or occurring by, metalepsy..

Sodium :: Sodium (n.) A common metallic element of the alkali group, in nature always occuring combined, as in common salt, in albite, etc. It is isolated as a soft, waxy, white, unstable metal, so readily oxidized that it combines violently with water, and to be preserved must be kept under petroleum or some similar liquid. Sodium is used combined in many salts, in the free state as a reducer, and as a means of obtaining other metals (as magnesium and aluminium) is an important commercial product. Symbol

Hebdomadary :: Hebdomadary (a.) Consisting of seven days, or occurring at intervals of seven days; weekly..

Volborthite :: Volborthite (n.) A mineral occurring in small six-sided tabular crystals of a green or yellow color. It is a hydrous vanadate of copper and lime.

Frequency :: Frequency (n.) The condition of returning frequently; occurrence often repeated; common occurence; as, the frequency of crimes; the frequency of miracles..

Jarosite :: Jarosite (n.) An ocher-yellow mineral occurring on minute rhombohedral crystals. It is a hydrous sulphate of iron and potash.

Siderosis :: Siderosis (n.) A sort of pneumonia occuring in iron workers, produced by the inhalation of particles of iron..

Dawsonite :: Dawsonite (n.) A hydrous carbonate of alumina and soda, occuring in white, bladed crustals..

Swimming :: Swimmeret (n.) One of a series of flat, fringed, and usually bilobed, appendages, of which several pairs occur on the abdominal somites of many crustaceans. They are used as fins in swimming..

Bitumen :: Bitumen (n.) Mineral pitch; a black, tarry substance, burning with a bright flame; Jew's pitch. It occurs as an abundant natural product in many places, as on the shores of the Dead and Caspian Seas. It is used in cements, in the construction of pavements, etc. See Asphalt..

Selah :: Selah (n.) A word of doubtful meaning, occuring frequently in the Psalms; by some, supposed to signify silence or a pause in the musical performance of the song..

Contemporaneous :: Contemporaneous (a.) Living, existing, or occurring at the same time; contemporary..

Up :: Up (n.) The state of being up or above; a state of elevation, prosperity, or the like; -- rarely occurring except in the phrase ups and downs..

Calomel :: Calomel (n.) Mild chloride of mercury, Hg2Cl2, a heavy, white or yellowish white substance, insoluble and tasteless, much used in medicine as a mercurial and purgative; mercurous chloride. It occurs native as the mineral horn quicksilver..

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