(Math.) A straight, horizontal mark placed over two or more members of a compound quantity, which are to be subjected to the same operation, as in the expression x^(2) + y^(2) - x + y.
3.
(Anat.) A band or bundle of fibers; a fraenum.
4.
(Zool.) A commissure uniting the two main tendons in the foot of certain birds.
... the conversion of Christianity into a revealed doctrine."[459]) If about the middle of the second century the short confession of the Lord Jesus Christ was regarded as a watchword, passport, and tessera hospitalitas (signum et vinculum), and if even in lay and uneducated circles it was conceived as "doctrine" in contradistinction to heresy, this transformation must have been accelerated through men, who essentially conceived Christianity as the "divine doctrine," and by whom all its distinctive ... — History of Dogma, Volume 2 (of 7) • Adolph Harnack
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