buckbean perennial plant of Europe and America having racemes of white or purplish flowers and intensely bitter trifoliate leaves; often rooting at water margin and spreading across the surface
backspin spin that retards or reverses the forward motion
backbone the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
backpack a bag carried by a strap on your back or shoulder
back pack a bag carried by a strap on your back or shoulder
backup man someone who takes the place of another
black pine tall symmetrical pine of western North America having long blue-green needles in bunches of 3 and elongated cones on spreading somewhat pendulous branches; sometimes classified as a variety of ponderosa pine
bogbean perennial plant of Europe and America having racemes of white or purplish flowers and intensely bitter trifoliate leaves; often rooting at water margin and spreading across the surface
backband a broad band that passes over the back of a horse and supports the shafts of a vehicle
back down move backwards from a certain position
backup the act of providing approval and support
jack pine slender medium-sized two-needled pine of eastern North America; with yellow-green needles and scaly grey to red-brown fissured bark
black bean black-seeded bean of South America; usually dried
backbeat a loud steady beat
backdown a retraction of a previously held position
pigpen a pen for swine
packman someone who travels about selling his wares
bugbane North American plant having large leaves and yellowish green flowers growing in racemes; yields a toxic alkaloid used medicinally
duckpin a bowling pin that is short and squat by comparison with a tenpin
papain a proteolytic enzyme obtained from the unripe papaya