From BiblePortal Wikipedia

Hawker's Poor Man's Concordance And Dictionary [1]

This, as a corresponding name to the former, is frequently in the Scriptures applied to Christ. John the Baptist beautifully describes Jesus under this character,  John 3:28, etc. And Christ himself,  Matthew 9:5;  Mark 2:19-20.

See Husband

Wilson's Dictionary of Bible Types [2]

 Isaiah 61:10 (a) In this and in other passages, the Bridegroom is the Lord Jesus Himself. In the Old Testament, the Bride is Israel and the Bridegroom is the Father, but in the New Testament, the Bride is the church, and the Bridegroom is the Lord JESUS. (See also  Matthew 25:1).

Morrish Bible Dictionary [3]

A title which the Lord applies to Himself.  Matthew 9:15;  Matthew 25:1-10; cf.  John 3:29 . It anticipates the joy of Christ, the marriage-day when He will take to Himself all that for which He suffered so much.

King James Dictionary [4]

BRI'DEGROOM, n. A man newly married or a man about to be married. The passage of Shakespeare cited by Johnson proves that the last definition is just.

As are those dulcet sounds in break of day,

That creep into the dreaming bridegroom's ear,

And summon him to marriage.

BRI'DEGROOM, n. See Bridegroom.

Baker's Evangelical Dictionary of Biblical Theology [5]

See Marriage

Webster's Dictionary [6]

(n.) A man newly married, or just about to be married.

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [7]

( חָתָן , Chathan', also "son-in-law;" Κυμφίος ). In the typical language of Scripture, the love of the Redeemer to the Church is vividly alluded to in the expression "the bride, the Lamb's wife" ( Revelation 21:9). Christ himself is also called "the bridegroom" in the same sense ( John 3:29). The figure, under various and extended forms, is of frequent occurrence in the O.T., to denote the union between Jehovah and the Jewish nation. (See Canticles); (See Nuptials).