Strong's #1060: bkowr (pronounced bek-ore')
 from 1069; firstborn; hence, chief:--eldest (son), firstborn(-ling).
Brown-Driver-Briggs Hebrew Lexicon:
 ּ 
  bekôr 
 
 1) firstborn, firstling
 
 1a) of men and women
 1b) of animals
 1c) noun of relation (figuratively)
 
  Part of Speech: noun masculine
Relation: from H1069
Usage:
This word is used 117 times:
Numbers 8:16: "of Israel; instead of such as open every womb,  even instead of the firstborn of all the children"
Numbers 8:17: "For all  the firstborn of the children are mine, both man and beast: on the day"
Numbers 8:17: "on the day that I smote every  firstborn in the land of Egypt I sanctified"
Numbers 8:18: "the Levites for  the firstborn of the children of Israel."
Numbers 18:15: "shall be thine: nevertheless  the firstborn of man shalt thou surely redeem, and the firstling"
Numbers 18:15: "the firstborn of man shalt thou surely redeem,  and the firstling of unclean beasts shalt thou redeem."
Numbers 18:17: "But  the firstling of a cow, or of a sheep, or the firstling"
Numbers 18:17: "the firstling of a cow, or  the firstling of a sheep, or the firstling of a goat,"
Numbers 18:17: "of a sheep, or  the firstling of a goat, thou shalt not redeem; they"
Numbers 26:5: "Reuben,  the eldest son of Israel: the children Hanoch, of whom cometh the family of the Hanochites:"
Numbers 33:4: "For the Egyptians buried all  their firstborn, which the LORD had smitten"
Deuteronomy 15:19: "All  the firstling males that of thy herd and of thy flock thou shalt sanctify"
Deuteronomy 15:19: "thy God: thou shalt do no work  with the firstling of thy bullock, nor shear the firstling"
Deuteronomy 15:19: "of thy bullock, nor shear  the firstling of thy sheep."
Deuteronomy 21:15: "him children, both the beloved and the hated;  and if the firstborn son be hers that was hated:"
Deuteronomy 21:16: "before the son of the hated,  which is indeed the firstborn:"
Deuteronomy 21:17: "the son of the hated  for the firstborn, by giving him a double portion of all"
Deuteronomy 25:6: "And it shall be,  that the firstborn which she beareth in the name of his brother"
Deuteronomy 33:17: "His glory  is like the firstling of his bullock, and his horns of unicorns: with them he shall push the people"
Joshua 6:26: "Jericho: he shall lay the foundation  thereof in his firstborn, and in his youngest son shall he set up the gates"
Joshua 17:1: "of Manasseh; he  was the firstborn of Joseph; to wit, for Machir the firstborn of Manasseh,"
Joshua 17:1: "was the firstborn of Joseph; to wit, for Machir  the firstborn of Manasseh, the father of Gilead: because"
Judges 8:20: "And he said unto Jether  his firstborn, Up, them. But the youth drew not"
1 Samuel 8:2: "Now the name  of his firstborn was Joel; of his second, Abiah: they were judges"
1 Samuel 17:13: "that went to the battle were Eliab  the firstborn, and next unto him Abinadab, and the third"
2 Samuel 3:2: "were sons born in Hebron:  and his firstborn was Amnon, of Ahinoam the Jezreelitess;"
1 Kings 16:34: "Jericho: he laid the foundation thereof in Abiram  his firstborn, and set up the gates thereof in his youngest son Segub,"
2 Kings 3:27: "Then he took  his eldest son should have reigned in his stead, and offered"
1 Chronicles 1:13: "begot Zidon  his firstborn, and Heth,"
1 Chronicles 1:29: "These are their generations:  The firstborn of Ishmael, then Kedar, and Adbeel, and Mibsam,"
1 Chronicles 2:3: "unto him of the daughter of Shua the Canaanitess. And Er,  the firstborn of Judah, was evil"
1 Chronicles 2:13: "And Jesse begot  his firstborn Eliab, and Abinadab the second,"
1 Chronicles 2:25: "And the sons of Jerahmeel  the firstborn of Hezron Ram the firstborn, and Bunah,"
1 Chronicles 2:25: "of Hezron Ram  the firstborn, and Bunah, and Oren, and Ozem, and Ahijah."
1 Chronicles 2:27: "And the sons of Ram  the firstborn of Jerahmeel Maaz, and Jamin, and Eker."
1 Chronicles 2:42: "the brother of Jerahmeel  his firstborn, which was the father of Ziph; and the sons"
1 Chronicles 2:50: "of Caleb of Hur,  the firstborn of Ephratah; Shobal the father of Kirjath-jearim,"
1 Chronicles 3:1: "were born unto him in Hebron;  the firstborn Amnon, of Ahinoam the Jezreelitess; the second"
1 Chronicles 3:15: "And the sons of Josiah  were, the firstborn Johanan, Jehoiakim, the third Zedekiah,"
1 Chronicles 4:4: "These are the sons of Hur,  the firstborn of Ephratah, the father of Bethlehem."
1 Chronicles 5:1: "Now the sons of Reuben  the firstborn of Israel, he was the firstborn; but, forasmuch as he defiled"
1 Chronicles 5:1: "of Israel, he  was the firstborn; but, forasmuch as he defiled his father's bed, his birthright"
1 Chronicles 5:3: "The sons, I say, of Reuben  the firstborn of Israel and Pallu, Hezron, and Carmi."
1 Chronicles 6:28: "And the sons of Samuel;  the firstborn Vashni,"
1 Chronicles 8:1: "begot Bela  his firstborn, Ashbel the second, and Aharah the third,"
1 Chronicles 8:30: " And his firstborn son Abdon, and Zur, and Baal, and Nadab,"
1 Chronicles 8:39: "of Eshek his brother were, Ulam  his firstborn, Jehush the second, and Eliphelet the third."
1 Chronicles 9:5: "And of the Shilonites; Asaiah  the firstborn,"
1 Chronicles 9:31: "one of the Levites, who  was the firstborn of Shallum the Korahite, had the set office over"
1 Chronicles 9:36: " And his firstborn son Abdon, then Zur, and Baal, and Ner, and Nadab,"