One of the mysteries of the English language finally explained.
Of, relating to, or designating a colubrid snake having the rear one or two pairs of teeth in the upper jaw modified as fangs, with grooves to conduct the venom; back-fanged.
Late 19th century; earliest use found in The Athenaeum. Either from French opisthoglyphe opisthoglyph + -ous, or from scientific Latin Opisthoglypha, former group name + -ous.
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