This chapter focusses on the terminologies in bioethics. The term bioethics was coined by oncologist Van Rensselaer Potter. An exploration of ethical dilemmas arising in the healthcare field, as well as relating to medical aspects of human beings. Ethics is the systematic study of how we ought to act toward ourselves and others. Medical ethics is a branch of ethics. The definition of bioethics, ethics, autonomy, beneficence, consent, nonmaleficence, deontology, utilitarianism, abortion, categorical imperative, competence, confidentiality, consequentialism, descriptive ethics, emotivism, empiricism, ethical absolutism, ethical egoism, ethical relativism, euthanasia, morality, normative ethics, paternalism, prima facie duty, proposition, slippery slope argument, supererogatory act, triage, virtue ethics, altruism, situation ethics, artificial insemination, artificial womb, biocentrism, anthropocentrism, biopiracy, brain computer interface, chimera, medical confidentiality, cryonics, eugenics, faith healing, gene therapy, human cloning, iatrogenesis, lobotomy, nanomedicine, placebo, reprogenetics, three parent babies, and advance care planning has been also provided in this chapter.