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premandibular
premandibular adj. and n.
Brit. 
/ˌpriːmanˈdɪbjᵿlə/
, /ˌpriːmanˈdɪbjᵿlə/U.S. /ˌpriˌmænˈdɪbjələr/
Zoology (a) adj. situated in front of or anterior to the mandible; †(b) n. a premandibular bone occurring in the lower jaw of some fishes, reptiles, etc. (obsolete)./ˌpriˌmænˈdɪbjələr/ΚΠ
1845 R. Owen Odontography I. 96 The premandibular pieces of the lower jaw are similarly paved with two rows of hemispherical molars.
1854 R. Owen Struct. Skeleton & Teeth in Orr's Circle Sci.: Org. Nature I. 273 The exposed portions of the premaxillaries and premandibulars are incased by a complicated dental covering.
1900 L. C. Miall & A. R. Hammond Struct. & Life Hist. Harlequin Fly vi. 169 The third is the premandibular segment.
1986 A. S. Romer & T. S. Parsons Vertebr. Body (ed. 6) xvi. 563 Anteriorly, we may assume..only a single premandibular visceral arch and consider the terminalis as the nerve of the region anterior to the gills.
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as lemmas