actinoid

• Adjectif désignant ce qui a une forme ou une structure rayonnante, semblable à une étoile ou à un rayon ; utilisé dans des contextes biologiques ou descriptifs. Peut aussi se rapporter à la famille des actinides en chimie, bien que cet usage soit rare.

An obsolete adjective meaning having a radiated form or structure, like a star or ray; rarely used in modern English.

1. Relating to the actinide seriesC2formalscientific

   Pertaining to the series of radioactive metallic elements with atomic numbers 89 through 103 (actinium through lawrencium).

   actinide (relatif aux actinides)

   • Actinoid elements are typically found in the bottom row of the periodic table.
   • The chemical properties of actinoid compounds are complex.
   • Research on actinoid materials is important for nuclear science.

   Synonymesactinide

2. Having a radial formC2formalscientific

   Describing a shape or structure that radiates outward from a central point, like a star or a sea creature.

   Actinoïde (forme radiale)

   • The coral had an actinoid form, with tentacles spreading in all directions.
   • Some microscopic organisms exhibit an actinoid symmetry.
   • The artist's sculpture had an actinoid design, with arms extending from a central core.

   Synonymesradialradiateradiatingstar-shapedstellate

• Nom désignant tout élément du groupe des actinides, éléments métalliques radioactifs dont les numéros atomiques vont de 89 à 103. Peut aussi être un adjectif qualifiant ce qui a une forme radiale ou rayonnante.

A noun referring to any of a series of radioactive metallic elements with atomic numbers from 89 to 103, or an adjective describing something with a radial form.

1. Radioactive element seriesC2formalscientific

   Any of a series of radioactive metallic elements with atomic numbers ranging from 89 (actinium) to 103 (lawrencium).

   Actinide

   • Uranium and plutonium are well-known actinoids used in nuclear energy.
   • The actinoid series includes elements that are all radioactive.
   • Scientists study the chemical properties of actinoids for research purposes.

   Synonymesactinideactinide series

2. Radial formC2formalscientific

   Having a structure or form that radiates outward from a central point.

   forme radiale

   • The starfish exhibits an actinoid symmetry in its body plan.
   • Certain crystals display an actinoid arrangement of their facets.
   • The artist created an actinoid pattern with lines spreading from the center.