An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

A quadrilateral in which all four vertices lie on the circumference of a circle.

→ cyclic; → quadrilateral.

A triangle having three equal sides.

→ equi-, → lateral, → triangle.

Sé-pahlu-barâbar, from sé, → three, pahlu, → side, barâbar, → equal.

Of or relating to the → side; situated at, proceeding from, or directed to a side (Dictionary.com).

M.E., from O.Fr. latéral and directly from L. lateralis "belonging to the side," from latus "the side, flank; lateral surface."

Kenâri, relating to kenâr, → side.

A plane figure bounded by four straight lines.

From L. quadrilater(us) "four-sided," from L. quattuor, → four, + → lateral.