Among domestic cattle, a bull is specifically a fertile male; castrated males are called steers and are raised for meat or as beasts of burden when they are called oxen.
The constellation Taurus represents a bull.
See also: Papal bull
... Anemia, Pernicious[?]
Anencephaly spina bifida X linked[?]
Aneurysm of sinus of Valsalva[?]
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