tetra the cal

[Pref. tetra-, and Gr. thēkē =a box.] Bot . ( of a plant ) : Having four cells in the ovary. tet-ra-thi-on-ic, a . [Pref. tetra- ; Gr. the i on = sulphur, and Eng. suff. -ic.] Containing four atoms of sulphur. tetra thionic-acid, s. tettigonia with air, and then they a ume a moro or le globular form, floating belly upward, whence they are called Globe-fishes; and from their defensive spinous armor they are often known as Sea-hedgehogs. When captured they produce a sound probably by the expulsion of air from the œsophagus. Some of them are highly poisonous; but as the poisonous qualities of their flesh vary greatly in intensity in different species and in different localities, it is probable that they acquire the deleterious properties from their food, which consists of corals and hard-shelled mollusks, for crushing which the broad posterior surface of their jaws is well adapted. 2. Palæont.: From the Eocene of Monte Bolca and Licata.