In this article some works by Julian Huxley are analyzed with the intention of understanding the meaning that he gave to the word transhumanism. Huxley's intellectual search throughout his work as a scientist and as a humanist led him to transform his idea until he found the right word. The essence of his philosophical and religious concern is that he always looked for ways to transcend the limits of human nature. For the British biologist, the religious-scientific mission that supposes the belief in transhumanism leads to the conviction that the human being will be able to transcend his status as a species in order to concentrate all the fragments of his conscience in a total cosmic self-consciousness that gives fullness to the universal and unique substance of which it is a part.