This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of or pertaining to an etiology.

adj. Pertaining to, or inquiring into, causes; ætiological.

etc. See ætiological, etc.

adj. relating to the etiology of a disease

adj. of or relating to the philosophical study of causation

"The collective efforts by researchers in our group and others, and by clinicians, brought together sufficient data to convince the scientific community and the relevant authorities that LAV (later to be named human immunodeficiency virus, HIV) was the etiological agent of AIDS."

aetiological   

martensite    etiologic    colony-stimulating    non-discriminatory    pathophysiological    land-dwelling    allelic    taken-for-granted    neurochemical    epigenetic