• WordNet 3.6
    • n clypeus a shield-like plate on the front of an insect's head
    • ***
Webster's Revised Unabridged Dictionary
    • n Clypeus (Zoöl) The frontal plate of the head of an insect.
    • ***
Century Dictionary and Cyclopedia
    • n clypeus In archaeology: A large circular shield, with a convex outer and concave inner surface.
    • n clypeus An ornamental disk, of marble or other substance, in the shape of a shield, often sculptured in relief, hung in the intercolumniations of the atria of Roman dwellings, etc. Examples have been found at Pompeii and elsewhere.
    • n clypeus [NL.] In entomology, properly, that part of the upper surface of an insect's head which lies before the front or forehead, and behind the labrum when the latter is present; a fixed sclerite immediately in front of the epicranium, and to which the labrum is attached. See cut under Hymenoptera. By Huxley and other anatomists the front is included in this term, being distinguished as the clypeus superior, or supraclypeus. Some of the older entomologists, notably Fabricius and Illiger, applied the term clypeus to the labrum. In Diptera it is probably represented by the part called the hypostoma or face; but in that order the name is applied to a more or less horny fold on the upper part of the membrane connecting the proboscis with the border of the mouth, properly answering to the labrum. In the Heteroptera the clypeus is a process of the upper part of the head or crown, which in some species extends over the face. Often called the epistoma, especially when it is small or softer than the surrounding parts; also nasus and prælabrum.
    • n clypeus [capitalized] [NL.] A genus of fossil echinoderms. C. sinuatus is an example.
    • ***
Chambers's Twentieth Century Dictionary
    • n Clypeus klip′ē-us the shield-like part of an insect's head
    • ***


Webster's Revised Unabridged Dictionary
L., a shield
Chambers's Twentieth Century Dictionary
L. clipeus, clypeus, a shield.


In literature:

The face with silvery pile on each side of the clypeus, and sprinkled with erect black hairs.
"Journal of the Proceedings of the Linnean Society - Vol. 3" by Various
Chaperon: =clypeus or clypeus anterior.
"Explanation of Terms Used in Entomology" by John. B. Smith
The labrum, or upper lip, is separated by a deep suture from the clypeus, and is trapezoidal in form.
"Our Common Insects" by Alpheus Spring Packard
The head is extended from behind forwards, so that the crown (epicranium) is large, while the face (clypeus) is small.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 6" by Various
The portion of the face bounded by this groove is called the clypeus.
"Through a Microscope" by Samuel Wells
The labrum and clypeus are developed as a single prolongation of the oral piece, not as a pair of appendages.
"Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4" by Various