buttress thread
noun
/͵bʌtrəsʹθrɛd/
in Georgian | in Russian
ხერხისებრი ან ტრაპეციისებრი კუთხვილი (ხერხის კბილის ან მართკუთხა ტრაპეციის ფორმის პროფილის მქონე კუთხვილი) [შდრ. აგრ. trapezoidal thread].
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