dormant

Concise Oxford English Dictionary © 2008 Oxford University Press:
dormant/ˈdɔːmənt/

▶adjective

• 1 (of an animal) in or as if in a deep sleep.

  ■ Heraldry (of an animal) lying with its head on its paws.

• 2 (of a plant or bud) alive but not growing.

• 3 (of a volcano) temporarily inactive.

• 4 (of a disease) causing no symptoms but liable to recur.

– derivatives
dormancy noun.

– origin ME: from OFr., ‘sleeping’, pres. part. of dormir, from L. dormire ‘to sleep’.