e/Deltoid curve

Information
has gloss	eng: In geometry, a deltoid, also known as a tricuspoid, is a hypocycloid of three cusps. In other words, it is the roulette created by a point on the circumference of a circle as it rolls without slipping along the inside of a circle with three times its radius. It can also be defined as a similar roulette where the radius of the outer circle is 3/2 that of the rolling circle. It named after the Greek letter delta which it resembles.
lexicalization	eng: Deltoid curve
lexicalization	eng: Deltoid
instance of	(noun) a line on a graph representing data curve

Meaning
French
has gloss	fra: La deltoïde nest autre quune hypocycloïde à trois rebroussements. Elle fut étudiée pour la première fois par Léonard Euler en 1745.
lexicalization	fra: Deltoide
lexicalization	fra: Deltoïde
Italian
has gloss	ita: In geometria, la deltoide è una curva ipocicloide con tre cuspidi.
lexicalization	ita: deltoide
Russian
has gloss	rus: Дельтоида (кривая Штейнера) — плоская кривая, описываемая фиксированной точкой окружности, катящейся по внутренней стороне другой окружности, радиус которой втрое больше радиуса первой.
lexicalization	rus: Дельтоида