Sphrăg'īde, n.

n. [Fr. sphragide, Lat. sphragis, sphragidis, Lemnian earth, from Gr. σφραγίς, σφραγῖδος, a seal; — so called because sold in sealed packets.] (Min.) A species of ocherous clay which falls to pieces in water, with the emission of many bubbles; — called also earth of Lemnos and Lemnian earth.