Here you will find one or more explanations in English for the word Ethrea.
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Doublethreaded
Doublethreaded Dou"ble*thread`ed, a.
1. Consisting of two threads twisted together; using two
threads.
2. (Mech.) Having two screw threads instead of one; -- said
of a screw in which the pitch is equal to twice the
distance between the centers of adjacent threads.
Meaning of Ethrea from wikipedia