Definition of dys- in English:

dys-

combining form

Bad; difficult (used especially in medical terms): dyspepsia dysphasia

Origin

from Greek dus-; related to German zer-, also to Old English to-.

Definition of dys- in:

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Word of the day oleaginous
Pronunciation: ˌōlēˈajənəs
adjective
rich in, covered with, or producing oil; oily