Wordnet polsko-angielski 
                        
1. ( (mineralogy) two interwoven crystals that are mirror images on each other) 
twins 
synonim: pinakoid
2. 
dihedral angle, torsion angle: : synonim: kąt dwuścienny
3. 
dihedron: : 
Słownik techniczny polsko-angielski 
                        m dihedral, dihedron, pinacoid