Easton's Bible Dictionary (Psalm 140:3; Romans 3:13, "asp") is the rendering of, (1.) Akshub ("coiling" or "lying in wait"), properly an asp or viper, found only in this passage. (2.) Pethen ("twisting"), a viper or venomous serpent identified with the cobra (Naja haje) (Psalm 58:4; 91:13); elsewhere "asp." (3.) Tziphoni ("hissing") (Proverbs 23:32); elsewhere rendered "cockatrice," Isaiah 11:8; 14:29; 59:5; Jeremiah 8:17, as it is here in the margin of the Authorized Version. The Revised Version has "basilisk." This may have been the yellow viper, the Daboia xanthina, the largest and most dangerous of the vipers of Palestine. (4.) Shephiphon ("creeping"), occurring only in Genesis 49:17, the small speckled venomous snake, the "horned snake," or cerastes. Dan is compared to this serpent, which springs from its hiding-place on the passer-by. Noah Webster's Dictionary 1. (n.) One who, or that which, adds; esp., a machine for adding numbers. 2. (n.) A serpent. 3. (n.) A small venomous serpent of the genus Vipera. The common European adder is the Vipera (Pelias) berus. The puff adders of Africa are species of Clotho. 4. (n.) In America, the term is commonly applied to several harmless snakes, as the milk adder, puffing adder, etc. 5. (n.) Same as Sea Adder. Int. Standard Bible Encyclopedia ADDER ad'-er (`akhshubh (Psalm 140:3); pethen (Psalm 58:4); tsiph`oni (Proverbs 23:32); shephiphon (Genesis 49:17); tsepha` (King James Version margin; Isaiah 14:29)): This word is used for several Hebrew originals. In each case a poisonous serpent is clearly indicated by the context. It is impossible to tell in any case just what species is meant, but it must be remembered that the English word adder is used very ambiguously. It is from the Anglo-Saxon noedre, a snake or serpent, and is the common English name for Vipera berus, L, the common viper, which is found throughout Europe and northern Asia, though not in Bible lands; but the word "adder" is also used for various snakes, both poisonous and non-poisonous, found in different parts of the world. In America, for instance, both the poisonous moccasin (Ancistrodon) and the harmless hog-nosed snakes (Heterodon) are called adders. See SERPENT. Alfred Ely Day

Multi-Version Concordance Adder (9 Occurrences) Genesis 49:17 Dan will be a serpent in the way, an adder in the path, That bites the horse's heels, so that his rider falls backward. (WEB KJV ASV WBS YLT) Job 20:16 He shall suck cobra venom. The viper's tongue shall kill him. (See NIV) Psalms 58:4 Their poison is like the poison of a serpent: they are like the deaf adder that stoppeth her ear; (KJV ASV BBE DBY WBS RSV) Psalms 91:13 Thou shalt tread upon the lion and adder: the young lion and the dragon shalt thou trample under feet. (KJV ASV DBY WBS RSV) Psalms 140:3 They have sharpened their tongues like a serpent; adders' poison is under their lips. Selah. (Root in KJV ASV DBY WBS YLT) Proverbs 23:32 At the last it biteth like a serpent, and stingeth like an adder. (KJV ASV DBY WBS RSV) Isaiah 11:8 And the sucking child shall play on the hole of the asp, and the weaned child shall put his hand on the adder's den. (ASV DBY RSV) Isaiah 14:29 Don't rejoice, O Philistia, all of you, because the rod that struck you is broken; for out of the serpent's root an adder will emerge, and his fruit will be a fiery flying serpent. (WEB ASV RSV) Isaiah 59:5 They hatch adders' eggs, and weave the spider's web: he who eats of their eggs dies; and that which is crushed breaks out into a viper. (Root in WEB ASV NAS RSV NIV)