Dictionary.net

Oleagenous substances used topically to soothe, soften or protect skin or mucous membranes. They are used also as vehicles for other dermatologic agents.

Substances which relax and soften parts that are inflamed, or toe tense. They are used both internally and externally: as the former, however, consist of mucilaginous substances, they are generally reckoned as demulcents the latter, or proper emollients, consist of oils, cataplasms, fomentations, &e. Oleaginous bodies, rubbed on a part, act by diminishing its cohesion. Fomentations, in cases of internal inflammation, act probably through contiguous sympathy. The following are the chief emollients:- Adeps; Amygdalae Oleum; Avenae Farina; Cera: Cetaceum; Linum; Olivae: Oleum; Sesamum; Tritici Farina, and Ulmus.

Such things as sheath and soften the asperities of the humours, and relax and supple the solids.