pedilavium

The rite of foot-washing based on the act carried out by Jesus Christ on his disciples at the Last Supper. Depending on the church or denomination, it may be carried out at baptism, during Holy Communion, or as part of a Maundy Thursday ser

Part of the church service on Maundy Thursday is the pedilavium.

It is evident […] that the day [Maundy Thursday] was observed, as early as the fifth century, by the solemn celebration of the Lord's supper connected with the ceremony of the washing of feet (pedilavium). Augustin speaks of the celebration of the Lord's supper as being the more ancient and general custom, and of the pedilavium as of later introduction and more partial observance.

A footbath carried out for therapeutic purposes; a pediluvium.

[S]ome Diſorders of the Head, how remote ſoever therefrom, are hereby (together with other Remedies) excellently well provided for, on Account of the Community there is between theſe Parts, as well as others, by Means not only of the Blood-veſſels, but the nervous Fibrillæ alſo; ſo that ſome have apply'd Plaiſters to the Soles of the Feet to cauſe Reſt, inſtead of taking an hypnotic Draught; and I have known others by the Uſe of a Pedilavium, who have more certainly and pleaſantly procur'd to themſelves the ſame, when the common Doſe of Laudanum would do nothing to that Purpoſe; […]

In a Word, the Tea, Infuſion, Emulſion, and Syrup of the Seeds [of the poppy] are uſed in all ſevere internal Pains, […] And a Decoction of the Tops, Heads, Leaves, and Seeds in Baths, Pedilavia, Fomentations, Poultiſes, Ointments, &c. in all external Pains, and in Watchings, Cramps, and Stiffneſſes (if not from Cold, or cold Causes, &c.[).]