From BiblePortal Wikipedia

Hastings' Dictionary of the New Testament [1]

Artemas is mentioned only in  Titus 3:12, St. Paul urges Titus to ‘give diligence to come to’ him, ‘when I shall send Artemas unto thee, or Tychicus.’ This implies that Artemas was capable of relieving Titus in the oversight and organization of the Church in Crete. Therefore he must have been a Christian of considerable experience and of high character, and free to devote himself to Christian work; one of St. Paul’s companions from whom the ‘apostolic legates’ wore selected. The name is Greek; but that tells nothing about his nationality.

Literature.-articles in Hasting's Dictionary of the Bible (5 vols) on ‘Artemas,’ ‘Titus,’ and ‘Titus, Epistle to’; Expositor’s Greek Testament on  Titus 3:12.

J. E. Roberts.

Watson's Biblical & Theological Dictionary [2]

St. Paul's disciple, who was sent by that Apostle into Crete, in the room of Titus,  Titus 3:12 , while he continued with St. Paul at Nicopolis, where he passed the winter. We know nothing particular of the life or death of Artemas; but the employment to which he was appointed by the Apostle is a proof of his great merit.

Hastings' Dictionary of the Bible [3]

ARTEMAS . A trusted companion of St. Paul, in the later part of his life (  Titus 3:12 ). There is no evidence for the statements of Dorotheus ( Bibl. Maxima , Lugd. 1677, iii. p. 429) that he had been one of the 70 disciples, and was afterwards bishop of Lystra.

American Tract Society Bible Dictionary [4]

Apparently a faithful minister, cooperating with Paul,  Titus 3:12 , who thought him worthy to take the place of Titus at Crete, while the latter spent the winter with the apostle at Nicopolis.

Smith's Bible Dictionary [5]

Ar'temas. (Gift Of Artemis). A companion of St. Paul.  Titus 3:12. According to tradition, he was bishop of Lystra.

Fausset's Bible Dictionary [6]

Paul's companion ( Titus 3:12), whom he proposed sending to Titus at Crete. In tradition, bishop of Lystra.

Morrish Bible Dictionary [7]

Companion of Paul at Nicopolis.  Titus 3:12 .

Holman Bible Dictionary [8]

 Titus 3:12

International Standard Bible Encyclopedia [9]

ar´tē̇ - mas ( Ἀρτεμᾶς , Artemás ): One of the seventy disciples and bishop of Lystra, according to Dorotheus ( Bibl. Maxima (Lugd. 1677), III, 429). He is mentioned in   Titus 3:12 as one of the faithful companions of Paul. The name is probably Greek, a masculine form of Artemis , or, as has been suggested, a short form of Artemidorus, a common name in Asia Minor. These contracted forms were by no means rare in the Greek world. The Athenian orator, Lysias, was doubtless named after his grandfather, Lysanias, and at first may even have been called Lysanias himself.

Cyclopedia of Biblical, Theological and Ecclesiastical Literature [10]

( Ἀρτεμᾶς for Ἀρτεμίδωρος , Artemidorus, i.e. Given By Diana) occurs once (Tit. iii, 12) as the name of an esteemed disciple in connection with Tychichus, one of whom Paul designed to send into Crete to supply the place of Titus, when he invited the latter to visit him at Nicopolis. A.D. 63. Ecclesiastical tradition makes him to have been bishop of Lystra.

Kitto's Popular Cyclopedia of Biblial Literature [11]

Ar´temas. This name (which is a contraction for Artemidorus) occurs only once ( Titus 3:12), as that of an esteemed disciple whom St. Paul designed to send into Crete to supply the place of Titus, whom he invited to visit him at Nicopolis. When the Epistle was written, the Apostle seems not to have decided whether he should send Artemas or Tychicus for this purpose.