42 C.F.R. § 52.2
As used in this part:
Act means the Public Health Service Act, as amended (42 U.S.C. 201 et seq.).
Grantee means the institution, organization, individual or other person designated in the grant award document as the responsible legal entity to whom a grant is awarded under this part. The term shall also mean the recipient of a cooperative agreement awarded under this part.
HHS means the Department of Health and Human Services.
Principal investigator means the individual(s) judged by the applicant organization to have the appropriate level of authority and responsibility to direct the project or program supported by the grant and who is or are responsible for the scientific and technical direction of the project.
Project means the particular activity for which funding is sought under this part as described in the application for grant award.
Public Health Service and PHS means the operating division of the Department that consists of the Agency for Health Care Policy and Research, the Centers for Disease Control and Prevention, the Food and Drug Administration, the Health Resources and Services Administration, the Indian Health Service, the National Institutes of Health, the Office of the Assistant Secretary for Health, the Substance Abuse and Mental Health Administration, and the Agency for Toxic Substances and Disease Registry.
Research means a systematic investigation, study or experiment designed to contribute to general knowledge relating broadly to public health by establishing, discovering, developing, elucidating or confirming information about, or the underlying mechanisms relating to, the biological functions, diseases, or related matters to be studied.
Secretary means the Secretary of HHS and any other officer or employee of the HHS to whom the authority involved may be delegated.
42 C.F.R. §52.2