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Qu'est-ce (qui) est tetrahedral bead - définition
Inverted tetrahedral geometry; Tetrahedral geometry; Tetrahedral complex ion; Tetahedral molecular geometry; Tetrahedral coordination geometry; Examples of tetrahedral structures; Tetrahedral molecule; Tetrahedrally; Tetrahedral complex
![Ga2Cl6}} ("[[gallium trichloride]]").](https://commons.wikimedia.org/wiki/Special:FilePath/Gallium-trichloride-from-xtal-2004-3D-balls.png?width=200 "Ga2Cl6}} (\"[[gallium trichloride]]\").")
![<!-- specify width as minus sign vanishes at most sizes --> Calculating bond angles of a symmetrical tetrahedral molecule using a [[dot product]]](https://commons.wikimedia.org/wiki/Special:FilePath/Tetrahedral angle calculation.svg?width=200 "<!-- specify width as minus sign vanishes at most sizes --> Calculating bond angles of a symmetrical tetrahedral molecule using a [[dot product]]")
beads
![[[Merovingian]] bead](https://commons.wikimedia.org/wiki/Special:FilePath/Perle Verre Epoque mérovingienne Metz 29012017.jpg?width=200 "[[Merovingian]] bead")
![Gallic]], stone](https://commons.wikimedia.org/wiki/Special:FilePath/Pierre pendentif gauloise bijou.jpg?width=200 "Gallic]], stone")
![Bead, depicting a pomegranate]], dated to the [[Assyrian Empire]] of the 8th century BCE.](https://commons.wikimedia.org/wiki/Special:FilePath/Pomegranate carved in the round MET DP110584.jpg?width=200 "Bead, depicting a pomegranate]], dated to the [[Assyrian Empire]] of the 8th century BCE.")
SMALL DECORATIVE OBJECT WITH DRILLED HOLE
Beads; Decorative Bead; Decorative bead; Big hole bead; Draft:Iron-on beads
n. pl.
Rosary.
bead
SMALL DECORATIVE OBJECT WITH DRILLED HOLE
Beads; Decorative Bead; Decorative bead; Big hole bead; Draft:Iron-on beads
¦ noun
1. a small, rounded piece of glass, stone, plastic, etc., perforated and typically threaded in a string with others to make a necklace or rosary.
2. a drop of a liquid on a surface.
3. a small knob forming the foresight of a gun.
4. the reinforced inner edge of a tyre.
5. an ornamental plaster moulding resembling a string of beads or having a semicircular cross section.
¦ verb
1. decorate or cover with beads.
2. form into a string like beads.
Phrases
draw (or get) a bead on informal, chiefly N. Amer. take aim at with a gun.
Derivatives
beaded adjective
beading noun
Origin
OE gebed 'prayer', of Gmc origin; current senses derive from the use of a rosary (each bead representing a prayer).
bead
SMALL DECORATIVE OBJECT WITH DRILLED HOLE
Beads; Decorative Bead; Decorative bead; Big hole bead; Draft:Iron-on beads
(beads)
1.
Beads are small pieces of coloured glass, wood, or plastic with a hole through the middle. Beads are often put together on a piece of string or wire to make jewellery.
...a string of beads.
N-COUNT: usu pl
2.
A bead of liquid or moisture is a small drop of it.
...beads of blood...
He wiped away the beads of sweat on his forehead.
N-COUNT: usu N of n
Wikipédia
Tetrahedral molecular geometry
In a tetrahedral molecular geometry, a central atom is located at the center with four substituents that are located at the corners of a tetrahedron. The bond angles are cos−1(−1⁄3) = 109.4712206...° ≈ 109.5° when all four substituents are the same, as in methane (CH4) as well as its heavier analogues. Methane and other perfectly symmetrical tetrahedral molecules belong to point group Td, but most tetrahedral molecules have lower symmetry. Tetrahedral molecules can be chiral.
