A state of unconsciousness from which one may not wake up, usually induced by some form of trauma.
A tuft or bunch, such as the assemblage of branches forming the head of a tree, a cluster of bracts when empty and terminating the inflorescence of a plant, or a tuft of long hairs on certain seeds.
A cloud of dust surrounding the nucleus of a comet.
A defect characterized by diffuse, pear-shaped images that in an ideal image would appear as points.
A condition characterized by extreme fatigue or drowsiness, deep unresponsiveness, or prolonged sleep patterns.
A state of extreme torpor or apathy, especially with lack of emotion, energy or enthusiasm; (loosely) sluggishness, laziness.