|Easton's Bible Dictionary|
Mentioned in the list of unclean birds (Leviticus 11:18; Deuteronomy 14:16), is sometimes met with in the Jordan and the Sea of Galilee.
Noah Webster's Dictionary
1. (n.) Any one of numerous species of large aquatic birds belonging to Cygnus, Olor, and allied genera of the subfamily Cygninae. They have a large and strong beak and a long neck, and are noted for their graceful movements when swimming. Most of the northern species are white. In literature the swan was fabled to sing a melodious song, especially at the time of its death.
2. (n.) Fig.: An appellation for a sweet singer, or a poet noted for grace and melody; as Shakespeare is called the swan of Avon.
3. (n.) The constellation Cygnus.
Int. Standard Bible Encyclopedia
swon (tinshemeth, "chameleon," "tree-toad," "water-hen," "owl"; kuknos; Latin cygnus; Anglo-Saxon: swan and swon): Mentioned only in old versions and the Revised Version margin in Leviticus 11:18: "the swan, and the pelican, and the gier eagle," and in Deuteronomy 14:16 Septuagint porphurion = "water-hen"; Vulgate (Jerome's Latin Bible, 390-405 A.D.) ibis). In the Revised Version (British and American) this is rightly changed to "the horned owl, and the pelican, and the vulture." A bird of the duck family wrongly placed among the abominations in old versions of the Bible, now changed to horned owl.
White and gray swans spend their winter migratory season on the waters of the Holy Land. They are among the most ancient birds of history; always have been used for food; when young and tender, of fine flesh and delicious flavor; so there is no possibility that they were ever rightfully placed among the birds unsuitable for food. Their feeding habits are aquatic, their food in no way objectionable.
Swan (2 Occurrences)
Leviticus 11:18 And the swan, and the pelican, and the gier eagle, (KJV DBY WBS YLT)
Deuteronomy 14:16 The little owl, and the great owl, and the swan, (KJV DBY WBS YLT)