Freebase(0.00 / 0 votes)Rate this definition: Hydraulic conductivity. Hydraulic conductivity, symbolically represented as, is a property of vascular plants, soil or rock, that describes the ease with which a fluid can move through pore spaces or fractures.
Crispus Attucks was an African-American man killed during the Boston Massacre, making him the first casualty of the American Revolution.
Edward G. Walker (1830-1901), son of David Walker, one of the first two black men elected to the Massachusetts State Legislature. Just five years after he arrived in Boston, Walker died suddenly in the summer of 1830.