Of or pertaining to a tube; specifically, of or pertaining to one of the Fallopian tubes; as, tubal pregnancy.

of or relating to occurring in a tube such as e.g. the fallopian tube or eustachian tube; "tubal ligation"; "tubal pregnancy"

Tubal, according to Book of Genesis chap. 10 (the Table of Nations), was the name of a son of Japheth, son of Noah.

a minor operation that is usually done in a clinic or a hospital