This denoted etymologically ‘something woven’: it came via Old French toile from Latin tēla, a contraction of an earlier *texlā, which was derived from the base *tex- ‘weave’ (source of English text, textile, etc). Toilet [16] was borrowed from French toilette, a diminutive form of toile. It originally meant ‘cloth cover’, but it gradually evolved via ‘cloth cover for a dressing table’ to ‘the act of dressing and grooming oneself’.

The sense ‘lavatory’ emerged in mid 19th-century America, from the now obsolete ‘dressing room (with lavatory attached)’, inspired no doubt by the same delicacy that produced American English bathroom ‘lavatory’. Another member of the same word-family is tiller [15], which came via Anglo-Norman telier ‘weaver’s beam’ from medieval Latin tēlārium, a derivative of tēla.
=> abstruse, protrude; technical, text, textile, texture, tiller, tissue, toilet