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单词 isochasm
释义

> as lemmas

isochasm
isochasm n.
Brit. /ˈʌɪsə(ʊ)ˌkaz(ə)m/
,
U.S. /ˈaɪsəˌkæz(ə)m/
[ < Greek χάσμα gap, chasm n.] a line on a map, etc. connecting places having equal frequency of auroral displays.
ΘΚΠ
the world > the universe > luminous appearance > [noun] > aurora > isochasm
iso-aurore1885
isochasm1885
1885 S. Tromholt Aurora Borealis I. 240 This interesting chart, which he has called an ‘isochasm’ chart, and the lines denoted ‘isochasmes’.
1886 Edinb. Rev. Oct. 425 Isochasms or lines of equal auroral frequency.
extracted from iso-comb. form
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as lemmas
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