v. Obs. [f. L. extrā outwards + vert-ĕre to turn: see EXTROVERT.] trans. To turn outwards so as to be visible. Chiefly in early Chemistry, to render visible or sensible (the latent constituents of a substance).
1669. W. Simpson, Hydrol. Chym., II. iii. 52. It is not the moist air that extraverts any preexistent nitrous parts from the body of the minerals.
a. 1691. Boyle, Imperfect. Doctr. Qual., vii. The sulphur, or other hypostatical principle, is intraverted or extraverted, or as others speak, inverted. Ibid., High Veneration (1835), 50. All things are naked, and … extraverted to his eyes.
