| addendum | Origin: L, fr. Addere to add. A thing to be added; an appendix or addition. <mechanics> Addendum circle, the circle which may be described around a circular spur wheel or gear wheel, touching the crests or tips of the teeth. Source: Websters Dictionary (01 Mar 1998) |
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| adder | 1. A serpent. "The eddre seide to the woman." 2. <zoology> A small venomous serpent of the genus Vipera. The common European adder is the Vipera (or Pelias) berus. The puff adders of Africa are species of Clotho. In America, the term is commonly applied to several harmless snakes, as the milk adder, puffing adder, etc. Same as Sea Adder. In the sculptures the appellation is given to several venomous serpents, sometimes to the horned viper (Cerastles). Origin: OE. Addere, naddere, eddre, AS. Naedre, adder, snake; akin to OS. Nadra, OHG. Natra, natara, Ger. Natter, Goth. Nadrs, Icel. Naor, masc, naora, fem., cf. W. Neidr, Gorn. Naddyr, Ir. Nathair, L. Natrix, water snake. An adder is for a nadder. Source: Websters Dictionary (01 Mar 1998) |
| adder's-tongue | <botany> A genus of ferns (Ophioglossum), whose seeds are produced on a spike resembling a serpent's tongue. The yellow dogtooth violet. Source: Websters Dictionary (01 Mar 1998) |
| adderwort | <botany> The common bistort or snakeweed (Polygonum bistorta). Source: Websters Dictionary (01 Mar 1998) |