What does «tetrakis» mean in Spanish?

(tetrakis-) prefix used in chemistry that is synonymous with tetra.

Examples of use in Spanish: "Toxicidad del sulfato de tetrakis(hidroximetil) fosfonio".

"Ensayaron con el muy reactivo tetrakis (dimetilamino) etileno".
(tetrakis-) Among the Pythagoreans, the sum of the first four natural numbers (10) expressed geometrically or numerically. Four and ten were considered sacred numbers by the ancient Pythagoreans and they swore by the Tetrakis.

Examples of use in Spanish: "La más importante de estas figuras era la «tetrakis de la década» (atribuida al propio Pitágoras); que representa al número 10 como la suma de los primeros cuatro íntegros." Diccionario Akal de Historia del mundo antiguo - Página 296

"dentro de la figura triangular conocida como tetrakis, sobre la que se dice que juraban sigilo (secreto) los discípulos de Pitágoras".
(hexaedro tetrakis) Also called a tetraquishexahedron, it is one of Catalan's solids. It looks like a cube or die with 24 faces and each face is an isosceles triangle. It has 36 edges and 14 vertices.