PENETRATION n. 2 definitions
trating into, or comprehending, anything difficult. And to each in ward part, With gentle penetration, though unseen, Shoots invisible virtue even to the deep. Milton. A penetration into the difficulties of algebra. Watts.
RONTGEN RAY n.
pon surface of a solid (as the wall of the vacuum tube). Röntgen rays are noted for their penetration of many opaque substances, as wood and flesh, their action on photographic plates, and their fluorescent effects. They were called X rays by their discoverer, W. K. Röntgen. They also ionize gases, but cannot be reflec…
SAGACIOUS a.
Hence, of quick intellectual perceptions; of keen penetration and judgment; discerning and judicious; knowing; far-sighted; shrewd; sage; wise; as, a sagacious man; a sagacious remark. Instinct . . . makes them, many times, sagacious above our apprehension. Dr. H. More. Only sagacious heads light on these observations,…