From an unused root meaning to lacerate; the eagle (or other large bird of prey) -- eagle.
נֶשֶׁר noun masculineDeuteronomy 32:11 griffon-vulture, eagle (Late Hebrew id.; Assyrian našru; נַשְׁרָא ᵑ7; Syriac Arabic vulture (Lane2780), vulgar Ethiopic Di641; Sabean נסר proper name, of deity, and נסר ביתן DHMZMG. xxix (1875), 600; xxxvii (1883), 356); — absolute ׳נ Hosea 8:1 +; נָָֽשֶׁד Deuteronomy 28:49 +; plural נְשָׁרִים 2 Samuel 1:23 +, construct נִשְׁרֵי Lamentations 4:19; — sometimes (perhaps not always) the griffon-vulture (TristrNHB 172 ff. DrDeuteronomy 14:12 NowArchi i. 84 Lane2780), Micah 1:16 (bald, in simile) flying swiftly to pery Habakkuk 1:8; Job 9:26, compare Proverbs 30:17 (׳בְּנֵינֿ, unclean Leviticus 11:13; Deuteronomy 14:12; soaring Job 30:27, also in simile Proverbs 23:5; Isaiah 40:31; Obadiah 4, building nest high Jeremiah 49:16 (compare also Job 39:27); as swift also 2 Samuel 1:23, especially of Babylonian and Assyr. invader Jeremiah 4:13; Lamentations 4:19, compare Hosea 8:1; Deuteronomy 28:49; Jeremiah 48:40; 49:22 (all in comparisons), הַגָּדוֺל הַנֶּשֶׁר Ezekiel 17:3 (figurativeof Nebuch.), 17:7 (figurative of king of Egypt); leaving no trace of light Proverbs 30:19; as renewing youth (by moulting) Psalm 103:5; as training and supporting its young Exodus 19:4 (E), Deuteronomy 32:11 (song); נ ׳מְּני of cherubim in vision Ezekiel 1:10; 10:4. — Only Micah 1:16 seems to compel reference to vulture (on eating fresh carrion by eagles see references in DiLeviticus 11:13), and ׳נ may be a more comprehensive word, including both vulture and eagle.