What does "dormant" mean?

Dormant: (Her.) In a sleeping posture; as, a lion dormant; -- distinguished from couchant. Dormant partner (Com.), a partner who takes no share in the active business of a company or partnership, but is entitled to a share of the profits, and subject to a share in losses; -- called also sleeping or silent partner. -- Dormant window (Arch.), a dormer window. See Dormer. -- Table dormant, a stationary table. [Obs.] Chaucer.

Additional senses

  1. 2.A large beam in the roof of a house upon which portions of the other timbers rest or " sleep." Arch. Pub. Soc. -- Called also dormant tree, dorman tree, dormond, and dormer. Halliwell.

Sources