| 单词 | addendum |
| 释义 | addendum /euh den"deuhm/, n. , pl. addenda /-deuh/ for 1, 2; addendums for 3. 1. a thing to be added; an addition. 2. an appendix to a book. 3. Mach. a. the radial distance between the tip of a gear tooth and the pitch circle of a gear or the pitch line of a rack. Cf. dedendum. b. Also called addendum circle. an imaginary circle touching the tips of the teeth on a gear. [1785-95; neut. sing. of L addendus to be added, gerundive of addere to ADD] |
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