• Webster's Revised Unabridged Dictionary
    • a Subcaudal (Anat) Situated under, or on the ventral side of, the tail; as, the subcaudal, or chevron, bones.
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Century Dictionary and Cyclopedia
    • subcaudal Situated under the tail; placed on the under side of the tail: as, subcaudal chevron-bones; the subcaudal scutes, or urosteges, of a snake.
    • subcaudal Not quite caudal or terminal; situated near the tail or tail-end; subterminal.
    • n subcaudal That which is subcaudal; specifically, in herpetology, a urostege; one of the special scutes upon the under side of the tail of a serpent.
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Chambers's Twentieth Century Dictionary
    • adj Subcaudal sub-kaw′dal beneath the tail.
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In literature:

Body cylindrical, scales small; ventral shields brown, rounded; tail rather short, tapering; subcaudal plates two, round.
"Journals Of Two Expeditions Of Discovery In North-West And Western Australia, Vol. 2 (of 2)" by George Grey
Hodgson states that a horribly offensive yellowish-grey fluid exudes from two subcaudal glands.
"Natural History of the Mammalia of India and Ceylon" by Robert A. Sterndale
In their geographic variation the ventrals and subcaudals follow clines, and do not in themselves warrant subspecific divisions.
"Occurrence of the Garter Snake, Thamnophis sirtalis, in the Great Plains and Rocky Mountains" by Henry S. Fitch
Our largest specimen, a male having 154 ventrals and 68 subcaudals, measured 508 (380 + 128).
"Some Reptiles and Amphibians from Korea" by Robert G Webb
The everted hemipenis reaches posteriorly to the eighth subcaudal scale.
"A Revision of Snakes of the Genus Conophis (Family Colubridae, from Middle America)" by John Wellman