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Definition of COLEOPTILE. : the first leaf of a monocotyledon forming a protective sheath about the plumule.
Rutile is a mineral composed primarily of titanium dioxide, TiO2. Rutile is the most common natural form of TiO2. Three rarer polymorphs of TiO2 are known: Anatase (sometimes known by the name octahedrite), a metastable tetragonal mineral of pseudo-octahedral habit. Brookite, an orthorhombic mineral.