gemelos

Gemelos is the Spanish word for twins, referring to two or more individuals born from the same pregnancy. In everyday use, gemelos can describe both identical twins and fraternal twins; the singular forms are gemelo (male), gemela (female), and their plurals gemelos or gemelas depending on gender. In genetics, twins are categorized by zygosity: monozygotic (identical) twins arise from a single fertilized egg that splits, while dizygotic (fraternal) twins develop from two separate eggs fertilized by two sperm. Monozygotic twins share nearly all their genetic material, whereas dizygotic twins are genetically similar to ordinary siblings. Twin studies compare similarities in traits and conditions across twin pairs to estimate hereditary influence and environmental effects.

Cufflinks in Spanish are also called gemelos. They are decorative fasteners used to secure the cuffs of shirts that require French cuffs. A gemelo typically consists of two matching pieces connected by a bar, chain, or post; one piece is inserted through the buttonholes in the cuff and the other is secured on the outside. They come in various materials and styles, including metal (silver, gold, stainless steel), enamel, wood, or gemstones, and can range from simple understated designs to elaborate pieces. They are most commonly associated with formal wear but are also worn in business or smart-casual attire.