# Periodic comet

Periodic comet
Periodic Pe`ri*od"ic, Periodical Pe`ri*od"ic*al, a. [L. periodicus, Gr. ?: cf. F. p['e]riodique.] 1. Of or pertaining to a period or periods, or to division by periods. [1913 Webster]

The periodicaltimes 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] TABLE OF THE PERIODIC LAW OF THE CHEMICAL ELEMENTS (The vertical columns contain the periodic groups) Series1[ 2[ 3[ 4[ 5[ 6[ 7[ 8[ 9[ 10[ 11[ 12[ -------------------------------------------------------------- |I. II. III. IV. V. VI. VII. VIII. | RH4 RH3 RH3 RH |R2O RO R3O3 RO2 R2O5 RO3 R2O7 RO4 -------------------------------------------------------------- H 1 [1913 Webster] Li 7 [1913 Webster] Na 23 [1913 Webster] K 39 [1913 Webster] (Cu) 63 [1913 Webster] Rb 85.2 [1913 Webster] (Ag) (108) [1913 Webster] Cs 133 [1913 Webster] (-) [1913 Webster] (-) [1913 Webster] (Au) (197) [1913 Webster] (-) [1913 Webster]

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Note: 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]

The Collaborative International Dictionary of English. 2000.

### Look at other dictionaries:

• periodic comet — noun A comet which orbits the Sun and which returns to the innermost point of its orbit at known, regular intervals. The computation of the elements of its orbit reveals the fact that they are almost identical with those of Comet III, 1869, and… …   Wiktionary

• periodic comet — noun : a comet that moves about the sun in a closed orbit …   Useful english dictionary

• Periodic — Pe ri*od ic, Periodical Pe ri*od ic*al, a. [L. periodicus, Gr. ?: cf. F. p[ e]riodique.] 1. Of or pertaining to a period or periods, or to division by periods. [1913 Webster] The periodicaltimes of all the satellites. Sir J. Herschel. [1913… …   The Collaborative International Dictionary of English

• Periodic function — Periodic Pe ri*od ic, Periodical Pe ri*od ic*al, a. [L. periodicus, Gr. ?: cf. F. p[ e]riodique.] 1. Of or pertaining to a period or periods, or to division by periods. [1913 Webster] The periodicaltimes of all the satellites. Sir J. Herschel.… …   The Collaborative International Dictionary of English

• Periodic law — Periodic Pe ri*od ic, Periodical Pe ri*od ic*al, a. [L. periodicus, Gr. ?: cf. F. p[ e]riodique.] 1. Of or pertaining to a period or periods, or to division by periods. [1913 Webster] The periodicaltimes of all the satellites. Sir J. Herschel.… …   The Collaborative International Dictionary of English

• Periodic star — Periodic Pe ri*od ic, Periodical Pe ri*od ic*al, a. [L. periodicus, Gr. ?: cf. F. p[ e]riodique.] 1. Of or pertaining to a period or periods, or to division by periods. [1913 Webster] The periodicaltimes of all the satellites. Sir J. Herschel.… …   The Collaborative International Dictionary of English

• Periodic time of a heavenly body — Periodic Pe ri*od ic, Periodical Pe ri*od ic*al, a. [L. periodicus, Gr. ?: cf. F. p[ e]riodique.] 1. Of or pertaining to a period or periods, or to division by periods. [1913 Webster] The periodicaltimes of all the satellites. Sir J. Herschel.… …   The Collaborative International Dictionary of English

• Comet Brooks — may refer to any one of 17 comets: C/1885 R1 (a.k.a. 1885 III, 1885c) C/1885 Y1 (a.k.a. 1885 V, 1885f) C/1886 H1 (a.k.a. 1886 V, 1886a) C/1886 J1 (a.k.a. 1886 III, 1886b) D/1886 K1 (a.k.a. 1886 IV, 1886c) C/1887 B2 (a.k.a. 1887 II, 1887b) C/1888… …   Wikipedia

• Comet Mrkos — may refer to any one of these comets discovered by Antonín Mrkos: C/1947 Y1 (a.k.a. 1948 II, 1948a) C/1952 H1 (a.k.a. 1952 V, 1952c) C/1952 W1 (a.k.a. 1953 II, 1952f) C/1955 L1 (a.k.a. 1955 III, 1955e) C/1956 E1 (a.k.a. 1956 III, 1956b) C/1957 P1 …   Wikipedia

• Comet Borrelly — may mean: The numbered periodic comet 19P/Borrelly (a.k.a. 19P/1904 Y2, 1905 II, 1904e, 19P/1911 S1, 1911 VIII, 1911e, 1918 IV, 1918c 1925 VIII, 1925f, 1932 IV, 1932i, 1953 IV, 1954b, 1960 V, 1960k, 1967 VIII, 1967m, 1974 VII, 1973m, 1981 IV,… …   Wikipedia