(chemistry) Any complex, having the general form of a rotaxane, but in which the linear component does not have bulky end groups.

(chiefly uncountable, literary) Anguish, grief, misery, or sorrow. / (countable, economics, ethics) In economics and utilitarianism: a unit of pain used to theoretically weigh people's outcomes.

Without a boiler.

(UK) A heavy-duty gelatinous, thixotropic substance used to clean grease and oil, etc. from the skin.