E″thi‐ops (?) n. [NL. See Ethiop.] (Old Chem.) A black substance; — formerly applied to various preparations of a black or very dark color. [Written also Æthiops.]
Ethiops martial(Old Chem.), black oxide of iron. — Ethiops mineral(Old Chem.), black sulphide of mercury, obtained by triturating mercury with sulphur. — Ethiops per se(Old Chem.), mercury in finely divided state, having the appearance of a dark powder, obtained by shaking it up or by exposure to the air.