English-Thai Dictionary
heptagonal
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Webster's 1828 Dictionary
HEPTAGONAL
a.Having seven angles or sides. Heptagonal numbers, in arithmetic, a sort of polygonal numbers, wherein the difference of the terms of the corresponding arithmetical progression is 5. One of the properties of these numbers is, that if they are multiplied by 4 , and 9 is added to the product, the sum will be a square number.
Webster's 1913 Dictionary
HEPTAGONAL
Hep *tag "o *nal, a. Etym: [Cf. F. heptagonal. ]
Defn: Having seven angles or sides. Heptagonal numbers (Arith.), the numbers of the series 1, 7, 18, 34, 55, etc. , being figurate numbers formed by adding successively the terms of the arithmetical series 1, 6, 11, 16, 21, etc.
Duden Dictionary
heptagonal
hep ta go nal Adjektiv |heptagon a l |siebeneckig
Spanish Dictionary
heptagonal
heptagonal adjetivo Que tiene forma de heptágono .
The Wordsmith Dictionary