45 CFR § 46.402 - Definitions.
The definitions in § 46.102 of subpart A shall be applicable to this subpart as well. In addition, as used in this subpart:
(a) Children are persons who have not attained the legal age for consent to treatments or procedures involved in the research, under the applicable law of the jurisdiction in which the research will be conducted.
(d) Parent means a child's biological or adoptive parent.
(e) Guardian means an individual who is authorized under applicable State or local law to consent on behalf of a child to general medical care.