• Webster's Revised Unabridged Dictionary
    • a Tergal (Anat. & Zoöl) Of or pertaining to back, or tergum. See Dorsal.
    • ***
Century Dictionary and Cyclopedia
    • tergal Of or pertaining to the back in general; dorsal; notæal: the opposite of sternal or ventral. Specifically
    • tergal In entomology, of or pertaining to a notum, tergum, or tergite.
    • tergal In echinoderms, dorsal in the sense of aboral; coronal: the opposite of ventral or oral: as, the tergal plates of a starfish.
    • tergal In trilobites, of or pertaining to the axis or tergum. See cut under Trilobita.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Tergal ter′gal pertaining to the back, dorsal
    • ***


Webster's Revised Unabridged Dictionary
L. tergum, the back
Chambers's Twentieth Century Dictionary
L. tergum, the back.


In literature:

Tergal suture: the Y shaped dorsal suture on the head of many insect larvae.
"Explanation of Terms Used in Entomology" by John. B. Smith
Tergal margin straight, overlapping about one third of the entire width of the terga.
"A Monograph on the Sub-class Cirripedia (Volume 1 of 2)" by Charles Darwin
The tergal elements of the somites bearing the antennae, mandibles and maxillae appear to be represented by the head-shield or cephalite.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6" by Various
It is represented by a full-sized tergal plate in the Pseudo-scorpiones.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3" by Various