A tiny air sac in the lungs. Plural alveoli.

1706, from Latin alveolus "a tray, trough, basin; bed of a small river," diminutive of alvus "belly, stomach, paunch, bowels; hold of a ship," from PIE *aulo- "hole, cavity&qu [..]

Sac in lungs absorbing oxygen from the air into the blood.

[noun] A small sac-like structure in the body, especially common in the lung. A lung alveolus has extremely thin walls that aid in the exchange of gases including O2 and CO2. Appears in modules:

grape-like cluster of tiny “balloons” in the lungs. ameba (amoeba)

(n) a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways(n) a bony socket in the alveolar ridge that holds a tooth

A hollow part of the Alveolar Process of the Maxilla or Mandible where each Tooth fits and is attached via the Periodontal Ligament.

Small polyhedral outpouchings along the walls of the alveolar sacs, alveolar ducts and terminal Bronchioles through the walls of which gas exchange between alveolar air and pulmonary Capillary Blood t [..]

Socket, as in tooth socket.

Tiny air-holding sac formed at the end of air passageways in the lungs, where the barrier between the air and the blood is a thin membrane.

(Pl. ALVEOLI) - A pocket in the cuticula accommodating a seta or similar unicellular structure.

Sac-like structure of the lung where oxygen exchange occurs. Alveoli are pleural.

A small cell containing air in the lungs, a sac-like dilation of the alveolar ducts in the lung (plural: alveoli) (27 Sep 1997)