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.
His father was likely a slave and his mother a Natick Indian. A 1750 ad in the Boston Gazette sought the recovery of a runaway slave named Crispas, but all that is definitely known about Attucks is that he was the first to fall during the Boston Massacre on March 5, 1770.