AURA n.
Any subtile, invisible emanation, effluvium, or exhalation from a substance, as the aroma of flowers, the odor of the blood, a supposed fertilizing emanation from the pollen of flowers, etc.
AURORA n.
e., northern daybreak; popularly called northern lights. A luminous meteoric phenomenon, visible only at night, and supposed to be of electrical origin. This species of light usually appears in streams, ascending toward the zenith from a dusky line or bank, a few degrees above the northern horizon; when reaching south…
AXIS n.
ll crystals, not of the isometric system, are either uniaxial or biaxial. -- Optic axis, Visual axis (Opt.), the straight line passing through the center of the pupil, and perpendicular to the surface of the eye. -- Radical axis of two circles (Geom.), the straight line perpendicular to the line joining their centers…
BALSAM n.
sp. the Abies balsamea. -- Canada balsam, Balsam of fir, Canada turpentine, a yellowish, viscid liquid, which, by time and exposure, becomes a transparent solid mass. It is obtained from the balm of Gilead (or balsam) fir (Abies balsamea) by breaking the vesicles upon the trunk and branches. See Balm.…
BANTU n.
oid tribes occupying equatorial and southern Africa. These tribes include, as important divisions, the Kafirs, Damaras, Bechuanas, and many tribes whose names begin with Aba-, Ama-, Ba-, Ma-, Wa-, variants of the Bantu plural personal prefix Aba-, as in Ba-ntu, or Aba-ntu, itself a combination of this prefix with the s…