| 释义 |
heptagon|ˈhɛptəgən|
[ad. Gr. ἑπτάγωνον, neut. of ἑπτάγωνος seven-cornered. Cf. F. heptagone (1542 in Hatz.-Darm.).]
1. Geom. A plane figure having seven angles and seven sides.
1570Billingsley Euclid i. xxxii. 42 In an heptagon, from one angle may be drawne lines to foure opposite angles. 1660Barrow Euclid iv. xi. Schol., The side of a Heptagone. 1885C. Leudesdorf Cremona's Proj. Geom. 187 Suppose it is required to inscribe in the conic a heptagon.
b. Fortif. A place strengthened with seven bastions for its defence.
1706in Phillips (ed. Kersey).
2. attrib. or adj. = heptagonal.
1775R. Putnam in Romans Florida 335 It [a fort] was built of a heptagon figure, with one side fronting the river. |