Haematosac n. : A vascular sac connected, beneath the brain, in many fishes, with the infundibulum.

Example:


Taxonomy
Hematoma, haematoma, blood, free encyclopedia, blood vessels, sac, muscle, bruises, skin, cork thigh, blood drained, diameter, internal organs, Sport injuries, search, free dictionary, external resources, fall down.

Defination from the web:
haematoma. ... For example, a patient who injures the base of his thumb might cause a haematoma, which will slowly move all through the finger within a week. ...