▪ I. ‖ diallage1 Rhet.
(daɪˈælədʒiː)
[mod.L. diallagē, a. Gr. διαλλαγή interchange, f. διαλλαγ- aorist stem of διαλλάσσειν to interchange, f. διά through, across + ἀλλάσσειν to change, make other than it is, f. ἄλλος other.]
A figure of speech by which arguments, after having been considered from various points of view, are all brought to bear upon one point.
| 1706 in Phillips (ed. Kersey). 1831 Crayons from Commons 44 And when a whole diallage was rear'd, Chagrined he found that no one member cheer'd. |
▪ II. diallage2 Min.
(ˈdaɪələdʒ)
[a. F. diallage, f. Gr. διαλλαγή (see prec.), named by Haüy 1801, from its dissimilar cleavages.]
A grass-green variety of pyroxene, of lamellar or foliated structure: formerly applied more widely to similar minerals, such as hypersthene, bronzite, etc.
| 1805 R. Jameson Char. Min. II. 605 Smaragdite, Saussure..Diallage, Hauy. 1811 Pinkerton Petral. I. 353 Metallic diallage, from Saxony. 1865 L'Estrange Yachting round W. Eng. 222 Some Serpentine is permeated by veins of golden diallage. 1879 Rutley Stud. Rocks x. 121 Some of the so-called diallages belong rather to enstatite than to pyroxene, since the crystallisation is rhombic. |
| attrib. 1843 Portlock Geol. 211 Hypersthene..passes into a greyish-green diallage, and, with a greenish felspar, forms the very beautiful diallage rock of those localities [Athenry]. 1855 J. D. Forbes Tour Mt. Blanc xi. 237 The boulders here seemed to be gabbro or diallage rock. |
Hence diallagic (daɪəˈlædʒɪk), a. [F. diallagique], diallagoid (daɪˈæləgɔɪd), a., containing or resembling diallage.
| 1847 Craig, Diallagic. 1879 Rutley Stud. Rocks x. 125 The diallagic augite sections are broad. Ibid. x. 132 The diallagoid augite of Boricky. |