In zo\u00f6l. and anat.: A spine, in any sense. The Spine, or spinal column; the backbone: more fully called spina dorsalis or spina dorsi, also columna spinalis. In ornithology, a genus of fringilline birds, the type of which is S. lesbia of southern Europe. Kaup, 1829. Also called Buscarla. See Spinus. In Roman antiquity, a barrier dividing the hippodrome longitudinally, about which the racers turned. One of the quills of a spinet or similar instrument. A slender projection from the upper, median portion of a bird's sternum, just between the articulations of the coracoids.