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.
Crispus Attucks. 1  Crispus Attucks, one of the first men to die for American Revolution, was a fugitive slave who had escaped from his master and had worked for twenty years as a merchant seaman. 2  Crispus Attucks was the first to fall in the celebrated Boston Massacre of 1770. Four other Americans died that night from the action. Samuel Adams used the incident to incite the colonists to further rebellion. Although only five people were killed, Adams termed it a massacre of innocent citizens by the tyrannical mother country.