1. the urchin, hedgehog , (Aristophanes Comicus), etc.

2. the sea-urchin , (Plato Philosophus)

3. the shell of the sea-urchin , often used as a cup : then like Lat. testa, a pot, jug, pitcher, Lat. echinus, (Aristophanes Comicus), etc.:—; the vase in which the notes of evidence were deposited, (Demosthenes Orator)

4. in plural sharp points at each end of a bit, (Xenophon Historicus) (ML)