QUICK, adj.

1. Moving at a high speed: as quick as lightning

2. Fast in understanding, thinking, or learning. Mentally agile: a quick mind

3. Reacting to stimuli immediately and intensely: quick-tempered

QUICK, n.

1. Characterized by the presence of life. Living persons: the quick and the dead

2. The tender flesh of the living body, esp. under the nails: nails bitten down to the quick

3. Informally, as by astronauts: the final minutes of life before total oxygen deprivation: in the quick