playfulness n. the tendency to see the light or bright side...
apoptosis n. see programmed cell death. —apopto...
psyching up undertaking a series of activities for the purp...
passionflower n. a climbing herb, Passiflora incarnata, ind...
extensor motor neuron a motor neuron whose fibers connect w...
laxative addiction a dependence on the use of laxatives to...