Толковый словарь английского языка Oxford English Reference - lavatorial

adj. (esp. of humour) relating to lavatories and their use. LAVATORY n. (pl. -ies) 1 a large receptacle for urine and faeces, usu. with running water and a flush mechanism as a means of disposal. 2 a room or compartment containing one or more of these. Phrases and idioms lavatory paper = toilet paper. Etymology: ME, = washing vessel, f. LL lavatorium f. L lavare lavat- wash