Jisho

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Noun, Noun which may take the genitive case particle 'no'
1. rhombus; rhomb; lozenge; diamond (shape)
Wikipedia definition
2. RhombusIn Euclidean geometry, a rhombus (◊), plural rhombi or rhombuses, is a quadrilateral whose four sides all have the same length. Another name is equilateral quadrilateral, since equilateral means that all of its sides are equal. A rhombus is necessarily convex. The rhombus is often called a diamond, after the diamonds suit in playing cards, or a lozenge, though the latter sometimes refers specifically to a rhombus with a 45° angle.
Read “Rhombus” on English Wikipedia
Read “菱形” on Japanese Wikipedia
Read “Rhombus” on DBpedia
Other forms
ひし形 【ひしがた】菱形 【りょうけい】

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