directrix (dÉªËrÉktrÉªks; daÉª-) n. 1. (Mathematics) geometry a fixed reference line, situated on the convex side of a conic section, that is used when defining or calculating its eccentricity. 2. (Professions) a directress [C17: New Latin, feminine of director] diâ¢recâ¢trix (dÉªËrÉk trÉªks, daÉª-)
e-Visa [edit]. Turkish e-visa can be obtained prior to arrival or on arrival (for a higher cost). Citizens of these countries are eligible to apply for a multiple entry e-Visa which allows to stay up to 90 days (unless otherwise stated):1  Antigua and Barbuda. 2  Armenia #. - Countries whose citizens are allowed to enter Turkey with their expired passports (up to 5 years). 3 - Allowed to enter Turkey with their passports or ID cards expired within the last year. Turkish e-visa can be obtained prior to arrival or on arrival (for a higher cost).
If you already have a visa, then this may not be a problem. If you still need to obtain your visa, then it probably will be. American citizens can obtain a single-entry visa that is valid for 3 months or a multiple-entry visa that is valid for 1 year from the Turkish embassy in the United States.Note, this process can take up to six weeks unless you expedite the service.merican citizens can obtain a single-entry visa that is valid for 3 months or a multiple-entry visa that is valid for 1 year from the Turkish embassy in the United States. Note, this process can take up to six weeks unless you expedite the service.