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.
Two years later United States Founding Father Samuel Adams, a cousin of John Adams, named the event the Boston Massacre, and helped ensure that it would not be forgotten. Boston artist Henry Pelham (half-brother of the celebrated portrait painter John Singleton Copley) created an image of the event.