One of the national languages of Nigeria and an important language of neighbouring Benin, Togo, and other western African nations, Yoruba is spoken by over 20 million people worldwide. This dictionary offers invaluable resources to both Yoruba and English speakers, enabling them to handle the complex scientific and mathematical terminology of today. This bilingual dictionary is brimming with useful vocabulary and technical information including medical terms, the basic chemical elements, as well as plant and animal taxonomy. Examples are given in both languages along with some parts of speech to help clarify ambiguous meanings.