Term: air sac: any of the membranous air-filled extensions of the lungs of birds
Broader: sac: a structure resembling a bag in an animal | Unrelated: suction cup: a cup-shaped device (made of rubber, glass, or plastic) that produces a partial vacuum; used to adhere or draw something to a surface
Broader: sac: a structure resembling a bag in an animal | Unrelated: electric eel: eel-shaped freshwater fish of South America having electric organs in its body
Broader: sac: a structure resembling a bag in an animal | Unrelated: cornsmut: a smut fungus attacking Indian corn
Broader: sac: a structure resembling a bag in an animal | Unrelated: pectoral vein: veins that drain the pectoral muscles and empty into the subclavian vein
Broader: sac: a structure resembling a bag in an animal | Unrelated: alligator: either of two amphibious reptiles related to crocodiles but with shorter broader snouts
Broader: sac: a structure resembling a bag in an animal | Unrelated: blastogenesis: theory that inherited characteristics are transmitted by germ plasm
Broader: sac: a structure resembling a bag in an animal | Unrelated: configuration: an arrangement of parts or elements
Broader: sac: a structure resembling a bag in an animal | Unrelated: foxhole: a small dugout with a pit for individual shelter against enemy fire
Broader: sac: a structure resembling a bag in an animal | Unrelated: circlet: a small circle
Broader: sac: a structure resembling a bag in an animal | Unrelated: succulence: a juicy appetizingness