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Conglomerate :: Conglomerate (n.) A rock, composed or rounded fragments of stone cemented together by another mineral substance, either calcareous, siliceous, or argillaceous; pudding stone; -- opposed to agglomerate. See Breccia..

Radiolaria :: Radiolaria (n. pl.) Order of rhizopods, usually having a siliceous skeleton, or shell, and sometimes radiating spicules. The pseudopodia project from the body like rays. It includes the polycystines. See Polycystina..

Amphidisc :: Amphidisc (n.) A peculiar small siliceous spicule having a denticulated wheel at each end; -- found in freshwater sponges.

Glass-sponge :: Glass-sponge (n.) A siliceous sponge, of the genus Hyalonema, and allied genera; -- so called from their glassy fibers or spicules; -- called also vitreous sponge. See Glass-rope, and Euplectella..

Hyalonema :: Hyalonema (n.) A genus of hexactinelline sponges, having a long stem composed of very long, slender, transparent, siliceous fibres twisted together like the strands of a color. The stem of the Japanese species (H. Sieboldii), called glass-rope, has long been in use as an ornament. See Glass-rope..

Diatom :: Diatom (n.) One of the Diatomaceae, a family of minute unicellular Algae having a siliceous covering of great delicacy, each individual multiplying by spontaneous division. By some authors diatoms are called Bacillariae, but this word is not in general use..

Suberone :: Suberite (n.) Any sponge of the genus Suberites and allied genera. These sponges have a fine and compact texture, and contain minute siliceous spicules..

Calcareo-siliceous :: Calcareo-siliceous (a.) Consisting of, or containing calcareous and siliceous earths..

Jaspilite :: Jaspilite (n.) A compact siliceous rock resembling jasper.

Spicule :: Spicule (n.) Any small calcareous or siliceous body found in the tissues of various invertebrate animals, especially in sponges and in most Alcyonaria..

Spiculispongiae :: Spiculispongiae (n. pl.) A division of sponges including those which have independent siliceous spicules.

Siliceous :: Siliceous (a.) Of or pertaining to silica; containing silica, or partaking of its nature..

Hornstone :: Hornstone (n.) A siliceous stone, a variety of quartz, closely resembling flint, but more brittle; -- called also chert..

Silicoidea :: Silicoidea (n. pl.) An extensive order of Porifera, which includes those that have the skeleton composed mainly of siliceous fibers or spicules..

Sand :: Sand (n.) Fine particles of stone, esp. of siliceous stone, but not reduced to dust; comminuted stone in the form of loose grains, which are not coherent when wet..

Bloodstone :: Bloodstone (n.) A green siliceous stone sprinkled with red jasper, as if with blood; hence the name; -- called also heliotrope..

Tetractinellida :: Tetractinellida (n. pl.) A division of Spongiae in which the spicules are siliceous and have four branches diverging at right angles. Called also Tetractinellinae.

Hexactinelline :: Hexactinelline (a.) Belonging to the Hexactinellinae, a group of sponges, having six-rayed siliceous spicules..

Novaculite :: Novaculite (n.) A variety of siliceous slate, of which hones are made; razor stone; Turkey stone; hone stone; whet slate..

Ventriculite :: Ventriculite (n.) Any one of numerous species of siliceous fossil sponges belonging to Ventriculites and allied genera, characteristic of the Cretaceous period..

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