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From The Collaborative International Dictionary of English v.0.48:
Thunder \Thun"der\, n. [OE. [thorn]under, [thorn]onder, [thorn]oner, AS. [thorn]unor; akin to [thorn]unian to stretch, to thunder, D. donder thunder, G. donner, OHG. donar, Icel. [thorn][=o]rr Thor, L. tonare to thunder, tonitrus thunder, Gr. to`nos a stretching, straining, Skr. tan to stretch. [root]52. See Thin, and cf. Astonish, Detonate, Intone, Thursday, Tone.] 1. The sound which follows a flash of lightning; the report of a discharge of atmospheric electricity. [1913 Webster] 2. The discharge of electricity; a thunderbolt. [Obs.] [1913 Webster] The revenging gods 'Gainst parricides did all their thunders bend. --Shak. [1913 Webster] 3. Any loud noise; as, the thunder of cannon. [1913 Webster] 4. An alarming or statrling threat or denunciation. [1913 Webster] The thunders of the Vatican could no longer strike into the heart of princes. --Prescott. [1913 Webster] Thunder pumper. (Zool.) (a) The croaker (Haploidontus grunniens). (b) The American bittern or stake-driver. Thunder rod, a lightning rod. [R.] Thunder snake. (Zool.) (a) The chicken, or milk, snake. (b) A small reddish ground snake (Carphophis amoena syn. Celuta amoena) native to the Eastern United States; -- called also worm snake. Thunder tube, a fulgurite. See Fulgurite. [1913 Webster]