| 单词 | periodic |
| 释义 | periodic periodic1 —periodically, adv. /pear'ee od"ik/, adj. 1. recurring at intervals of time: periodic revivals of an interest in handicrafts. 2. occurring or appearing at regular intervals: periodic visits of a mail steamer to an island. 3. repeated at irregular intervals; intermittent: periodic outbreaks of the disease. 4. Physics. recurring at equal intervals of time. 5. Math. (of a function) having a graph that repeats after a fixed interval (period) of the independent variable. 6. Astron. a. characterized by a series of successive circuits or revolutions, as the motion of a planet or satellite. b. of or pertaining to a period, as of the revolution of a heavenly body. 7. pertaining to or characterized by rhetorical periods, or periodic sentences. [1635-45; < L periodicus < Gk periodikós. See PERIOD, -IC] periodic2 /perr'uy od"ik/, adj. Chem. of or derived from a periodic acid. [1830-40; PER- + IODIC] |
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