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n. pl. teg·mi·na (-mə-nə)
A covering or integument, especially:
a. The thin plate of bone that covers the middle ear.
b. The tough leathery forewing of certain insects.
c. The inner layer of a seed coat.

[Latin tegimen, tegmen, covering, from tegere, to cover; see (s)teg- in Indo-European roots.]


n, pl -mina (-mɪnə)
1. (Zoology) either of the leathery forewings of the cockroach and related insects
2. (Botany) the delicate inner covering of a seed
3. (Botany) any similar covering or layer
[C19: from Latin: a cover, variant of tegimen, from tegere to cover]
ˈtegminal adj


(ˈtɛg mən)

n., pl. -mi•na (-mə nə)
1. a covering or integument, esp. of a plant or animal.
2. the delicate inner coat of a seed.
3. either of a pair of leathery forewings extending over the hind wings in certain insects.
[1800–10; < Latin: covering (also tegumen, tegimen) =teg(ere) to cover + -men n. suffix]
teg′mi•nal, adj.
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References in periodicals archive ?
The scutum, ossicles, and tegmen tympani are common sites for erosion.
Other cases have no connection to the CNS; instead, the connection may be provided by a small congenital defect in the tegmen tympani or overlying temporal bone.
Preoperative CT establishes the type of surgical procedure as it determines the extent of the cholesteatoma, ocular chain involvement, facial canal integrity, and tegmen tympani and dural plate involvement.
3-cm abscess at the left temporal lobe (figure 2) and a breach of the tegmen tympani.
Computed tomography showed a large, hyperdense dura-based mass along the left temporal bone invading the mastoid antrum, with destruction of the tegmen tympani.
Biochemical analysis of the fluid with beta-2-transferrin identified the fluid as CSE High-resolution computed tomography (CT) of the temporal bone demonstrated an extensively pneumatized but opaque mastoid and a defect in the tegmen tympani (figure).
Unlike a mastoid defect, a tegmen defect cannot be easily obliterated with bone wax because the tegmen tympani is not supported by underlying bone, and the pressure required to apply the wax can fracture it.
In light of the left temporal bone fracture and CSF otorrhea, we presumed that the entry point for the air into the cranial cavity was the mastoid bone, probably through defects in the tegmen tympani and dura.
Occasionally, an EACC extends into the middle ear cavity, facial nerve canal, mastoid cavity, or tegmen tympani.