The Collaborative International Dictionary of English v.0.48:
Imbathe \Im*bathe"\, v. t. [Pref. im- in + bathe. Cf. Embathe.] To bathe; to wash freely; to immerse. [1913 Webster] And gave her to his daughters to imbathe In nectared lavers strewed with asphodel. --Milton. [1913 Webster]