: difficult in a way that is usually interesting or enjoyable. Thesaurus: All synonyms and antonyms for challenging Nglish: Translation of challenging for Spanish speakers Britannica English: Translation of challenging for Arabic speakers.
To illustrate the tremendous indirect impact of emerging zoonotic diseases on public health policy and structures and on public perception of health risks, the authors provide a number of examples, including that of the Ebola virus, avian influenza, monkeypox and bovine spongiform encephalopathy.
zooid in Medicine. zooid zoÂ·oid (zÅ'oid') n. An organic cell or organized body that has independent movement within a living organism, especially a motile gamete such as a spermatozoon. An independent animallike organism produced asexually, as by budding or fission.