belonging or pertaining to the suborder Ophidia (Serpentes), comprising the snakes.
a snake.

1820–30; < Neo-Latin Ophidi(a) (plural) name of the suborder (< Greek ophídion (singular), equivalent to óph(is) serpent + -idion diminutive suffix) + -an

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World English Dictionary
ophidian (əʊˈfɪdɪən)
1.  snakelike
2.  of, relating to, or belonging to the Ophidia, a suborder of reptiles that comprises the snakes
3.  any reptile of the suborder Ophidia; a snake
[C19: from New Latin Ophidia name of suborder, from Greek ophidion, from ophis snake]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"pertaining to snakes," 1883, from Gk. ophidion, dim. of ophis "serpent," of unknown origin. Hence, ophiolatry "serpent-worship" (1862), and the 2c. sect of the Ophitæ, who revered the serpent as the symbol of divine wisdom. Also ophiomancy (1683), the ancient art of divination by the movements
of snakes.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
ophidian   (ō-fĭd'ē-ən)  Pronunciation Key 
A member of the suborder Ophidia or Serpentes; a snake.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Sensory cues used by rattlesnakes in their recognition of ophidian enemies.
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