PERIODIC
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Per`i*od "ic (?) , a .[Pref. per -iodic (Chem.) Pertaining to , derived from , or designating , the highest oxygen acid (HIO&unr_;) of iodine .1913 Webster ]
{ Pe`ri*od "ic (?) , Pe`ri*od "ic*al (?) , } a .[L . periodicus , Gr. &unr_;: cf. F . p ériodique 1. Of or pertaining to a period or periods , or to division by periods .1913 Webster ]
The periodical times of all the satellites .Sir J . Herschel.1913 Webster ]
2. Performed in a period , or regular revolution ; proceeding in a series of successive circuits ; as , the periodical motion of the planets round the sun 1913 Webster ]
3. Happening , by revolution , at a stated time ; returning regularly , after a certain period of time ; acting , happening , or appearing , at fixed intervals ; recurring ; as , periodical epidemics 1913 Webster ]
The periodic return of a plant 's flowering .Henslow. 1913 Webster ]
To influence opinion through the periodical press .Courthope. 1913 Webster ]
4. (Rhet.) Of or pertaining to a period ; constituting a complete sentence .1913 Webster ]
Periodic comet (Astron .) , a comet that moves about the sun in an elliptic orbit ; a comet that has been seen at two of its approaches to the sun .Periodic function (Math .) , a function whose values recur at fixed intervals as the variable uniformly increases . The trigonomertic functions , as sin x tan x etc ., are periodic functions . Exponential functions are also periodic , having an imaginary period , and the elliptic functions have not only a real but an imaginary period , and are hence called doubly periodic Periodic law (Chem.) , the generalization that the properties of the chemical elements are periodic functions of their atomic wieghts. “In other words , if the elements are grouped in the order of their atomic weights , it will be found that nearly the same properties recur periodically throughout the entire series .” The following tabular arrangement of the atomic weights shows the regular recurrence of groups (under I ., II., III., IV., etc .), each consisting of members of the same natural family . The gaps in the table indicate the probable existence of unknown elements .1913 Webster ]1913 Webster ]&hand_; A similar relation had been enunciated in a crude way by Newlands; but the law in its effective form was developed and elaborated by Mendelejeff, whence it is sometimes called Mendelejeff's law . Important extensions of it were also made by L . Meyer. By this means Mendelejeff predicted with remarkable accuracy the hypothetical elements ekaboron, ekaluminium, and ekasilicon, afterwards discovered and named respectively scandium , gallium , and germanium . 1913 Webster ]Periodic star (Astron .) , a variable star whose changes of brightness recur at fixed periods .Periodic time of a heavenly body (Astron .) , the time of a complete revolution of the body about the sun , or of a satellite about its primary .1913 Webster ]
