conejillo de Indias

conejillo de Indias m (plural conejillos de Indias)

1. guinea pig (animal)

   Synonyms: cobayo, cobaya, cuí, cuye, cuy, cuyo, cuyé

2. guinea pig (volunteer for an experiment)

• “conejillo de Indias”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), 23rd edition, Royal Spanish Academy, 2014 October 16