(†isathyd) a substance bearing the same relation to isatin that indigo-white bears to indigo-blue, being formed from it by the addition of one atom of hydrogen.
ΚΠ
1865–72 H. WattsDict. Chem. III. 411Isatyde is white, with a slightly greyish tint, tasteless, and inodorous. It..separates on cooling in microscopic scales.