Definitions
from The Century Dictionary.
 Having legs of equal length; isosceles.
from the GNU version of the Collaborative International Dictionary of English.
 adjective rare Having equal legs or sides; isosceles.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 adjective Having
legs of equal size;isosceles .
Etymologies
from Wiktionary, Creative Commons Attribution/ShareAlike License
Examples

For example, does it not require some pains and skill to form the general idea of a triangle, (which is yet none of the most abstract, comprehensive, and difficult,) for it must be neither oblique nor rectangle, neither equilateral, equicrural, nor scalenon; but all and none of these at once.

For example, does it not require some pains and skill to form the general idea of a triangle (which is yet none of the most abstract, comprehensive, and difficult); for it must be neither oblique nor rectangle, neither equilateral, equicrural, nor scalenon, but all and none of these at once?
A Treatise Concerning the Principles of Human Knowledge, by George Berkeley

What more easy than for anyone to look a little into his own thoughts, and there try whether he has, or can attain to have, an idea that shall correspond with the description that is here given of the general idea of a triangle, which is "neither oblique nor rectangle, equilateral, equicrural nor scalenon, but all and none of these at once?"
A Treatise Concerning the Principles of Human Knowledge, by George Berkeley

And for this reason it is that I conclude that to be true of any obliquangular or scalenon which I had demonstrated of a particular rightangled equicrural triangle, and not because I demonstrated the proposition of the abstract idea of a triangle And here it must be acknowledged that a man may consider a figure merely as triangular, without attending to the particular qualities of the angles, or relations of the sides.
A Treatise Concerning the Principles of Human Knowledge, by George Berkeley

Eye unless answered in Pairs, as in the Sides of an equicrural

'It must be (says he) neither oblique nor rectangular, neither equilateral, equicrural, nor scalenum; but all and none of these at once.

For example, does it not require some pains and skill to form the general idea of a triangle (which is yet none of the most abstract, comprehensive, and difficult); for it must be neither oblique nor rectangle, neither equilateral, equicrural, nor scalenon, but ALL AND

And for this reason it is that I conclude that to be true of any obliquangular or scalenon which I had demonstrated of a particular right  angled equicrural triangle, and not because I demonstrated the proposition of the abstract idea of a triangle And here it must be acknowledged that a man may consider a figure merely as triangular, without attending to the particular qualities of the angles, or relations of the sides.

Thus, when I demonstrate any proposition concerning triangles, it is to be supposed that I have in view the universal idea of a triangle; which ought not to be understood as if I could frame an idea of a triangle which was neither equilateral, nor scalenon, nor equicrural; but only that the particular triangle I consider, whether of this or that sort it matters not, doth equally stand for and represent all rectilinear triangles whatsoever, and is in that sense universal.
A Treatise Concerning the Principles of Human Knowledge, by George Berkeley

a triangle which was neither equilateral, nor scalenon, nor equicrural; but only that the particular triangle I consider, whether of this or that sort it matters not, doth equally stand for and represent all rectilinear triangles whatsoever, and is in that sense UNIVERSAL.
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