oesophagus(n = noun.body) esophagus, gorge, gullet - the passage between the pharynx and the stomach;
is a kind of passage, passageway, muscle system, muscular structure, musculature
is a part of alimentary canal, alimentary tract, digestive tract, digestive tube, gastrointestinal tract, gi tract
has parts: epicardia, cardiac sphincter

oesophagus, n. (US esophagus) (pl. oesophagi or -guses) the part of the alimentary canal from the mouth to the stomach; the gullet.

Derivative:
oesophageal adj.

Etymology:
ME f. Gk oisophagos