v. t. To put into a chest. [ 1913 Webster ]

n. [ F. inceste, L. incestum unchastity, incest, fr. incestus unchaste; pref. in- not + castus chaste. See Chaste. ] The crime of cohabitation or sexual intercourse between persons related within the degrees wherein marriage is prohibited by law; broadly, sexual relations between closely related persons, usually taken as first cousins or closer. Shak. [ 1913 Webster +PJC ]

Spiritual incest. (Eccl. Law) (a) The crime of cohabitation committed between persons who have a spiritual alliance by means of baptism or confirmation. (b) The act of a vicar, or other beneficiary, who holds two benefices, the one depending on the collation of the other. [ 1913 Webster ]

a. [ L. incestuosus: cf. F. incestueux. ] 1. Guilty of incest; involving, or pertaining to, incest; as, an incestuous person or connection. Shak. [ 1913 Webster ]

Ere you reach to this incestuous love,
You must divine and human rights remove. Dryden.

2. resembling incest; between people or groups so closely related as to make such activity improper or unethical; as, an incestuous coziness between the management of the company and its union; an incestuous relationship between the salesman and the purchasing manager. [ PJC ]

-- In*cest"tu*ous*ly, adv. -- In*cest"tu*ous*ness, n. [ 1913 Webster ]