1704 (implied in imbricated), from Latin imbricatus "covered with tiles," past participle of imbricare "to cover with rain tiles" (see imbrication). As an adjective from 1650s. Related: Imbricated; imbricating.
imbricate im·bri·cate (ĭm'brĭ-kāt') or im·bri·cat·ed (ĭm'brĭ-kā'tĭd)
Having the edges overlapping in a regular arrangement like roof tiles or the scales of a fish.