From bakar; firstborn; hence, chief -- eldest (son), firstborn(-ling).
see HEBREW bakar
H1060. bekor
בְּכוֺר122 noun masculine first-born — Genesis 35:23 78t.; בְּכֹר 25:13-14t.; suffix בְּכֹּרִי 49:3 14t.; בְּכוֺרוֺ 38:6 3t.; plural construct בְּכוֺרֵי Nehemiah 10:37 2t.; בְּכוֺרֵיהֶם Psalm 136:10; plural feminine בְּכֹרוֺת Genesis 4:4; Nehemiah 10:37; בְּכֹרֹת Deuteronomy 12:6, 17; 14:23; —
1 men and women:
a. individuals Genesis 25:13 69t.
b. collective Numbers 3:46, 50; 8:16; 18:15.
c. plural Nehemiah 10:37; Psalm 135:8; 136:10.
d. בכור כל Exodus 11:5; 12:12, 29; 13:2, 13, 15 (twice in verse); 22:28; 34:2; Numbers 3:12 (3 t. in verse); 3:13, 40, 42, 43, 45; 8:17 (twice in verse); 8:18; 33:4; Psalm 78:51; 105:36.
2 animals:
a. individuals Leviticus 27:26; Numbers 18:17; Deuteronomy 15:19 (twice in verse); 33:17.
b. collective בהמה בכור Exodus 11:5; 12:29; 13:15; Numbers 3:41; 18:15; הבכור כל Deuteronomy 15:19.
c. plural בכרות Genesis 4:4; Deuteronomy 12:6, 17; 14:23; Nehemiah 10:37.
3 figurative, noun of relation מות בכור first-born of death Job 18:13 (deadly disease); דַלִּים בְּכוֺרֵי first-born of the poor (the poorest) Isaiah 14:30; Israel is the first-born of Yahweh among the nations Exodus 4:22 compare Jeremiah 31:9; and the seed of David among dynasties Psalm 89:28.