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sub-basal

sub-ˈbasal, a.
  [sub- 1 b, 11.]
  Situated near or below the base of a part or organ. Also n., a sub-basal plate (Funk's Standard Dict. 1895).

1848 Proc. Berw. Nat. Club II. vi. 276 Nostrils sub-basal. 1870 Hooker Stud. Flora 172 Cornus sanguinea..lateral nerves subbasal. 1902 Proc. Zool. Soc. I. 48 The basal area of these wings irrorated with pearl-grey indicating two vague subbasal bands.

Oxford English Dictionary

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