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单词 pentadic
释义

pentadicadj.

Brit. /pɛnˈtadɪk/, U.S. /pɛnˈtædɪk/
Origin: Formed within English, by derivation. Etymons: pentad n., -ic suffix.
Etymology: < pentad n. + -ic suffix. With sense 2 compare pentadicity n.
1. Of the nature of a pentad; relating to or consisting of five people or things.
ΚΠ
1873 Scribner's Monthly 6 466/2 A descendant from one of King Adiçwara's pentadic hierarchy.
1937 S. K. Langer Introd. Symbolic Logic ii. 50 Some writers call any relation of more than dyadic degree ‘polyadic,’ even when it is definitely tetradic, pentadic, etc.
1983 Canad. Jrnl. Linguistics 28 170 On three sides of it, sets of the traditional runes could have been engraved while on the fourth the pentadic numerals from 1 through 5 as well as the numeral for 10 could have been given.
2000 G. C. Woodward in R. E. Denton Polit. Communication Ethics vi. 129 The pentadic template of narration: who, what, why, where, and when.
2. Chemistry. Pentavalent. Now rare.
ΘΚΠ
the world > matter > chemistry > valency > [adjective] > of or relating to combining powers of elements > having a power of five
pentadic1876
1876 Proc. Royal Soc. 25 166 This deportment suggests the possibility of a pentadic condition of the boron atom.
1917 Proc. Royal Soc. 1916–17 A. 93 78 If nitrogen be pentadic, as is..more in accordance with chemical facts, clearly four more units of volume must be added, making 28.
This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022).
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adj.1873
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