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inframarginal shield
inframarginal adj. 
/ˌɪnfrəˈmɑːdʒn̩l/,
Brit. /ˌɪnfrəˈmɑːdʒᵻnl/
, /ˌɪnfrəˈmɑːdʒᵻnl//ˌɪnfrəˈmɑːdʒn̩l/U.S. /ˌɪnfrəˈmɑrdʒən(ə)l/
situated beneath the margin or border: spec. (a) inframarginal cell, an outer cell in the anterior wing of certain aphides, lying behind the marginal cell; (b) inframarginal convolution, the superior temporal convolution; (c) inframarginal shield, one of the shields between the marginal and plastral in certain chelonians./ˌɪnfrəˈmɑrdʒən(ə)l/Π
1857 M. J. Berkeley Introd. Cryptogamic Bot. §611. 539 Dictyoxiphium has simple..fronds, infra~marginal sori.
1872 H. A. Nicholson Man. Palæontol. 109 Anus supra-marginal or infra-marginal.
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