GROUND n.
fine-grained or glassy base of a rock, in which distinct crystals of its constituents are embedded. -- Ground parrakeet (Zoöl.), one of several Australian parrakeets, of the genera Callipsittacus and Geopsittacus, which live mainly upon the ground. -- Ground pearl (Zoöl.), an insect of the family Coccidæ (Margarodes…
JOINT n.
bolt, a bolt for fastening two pieces, as of wood, one endwise to the other, having a nut embedded in one of the pieces. -- Joint chair (Railroad), the chair that supports the ends of abutting rails. -- Joint coupling, a universal joint for coupling shafting. See under Universal. -- Joint hinge, a hinge having long…