concavo-convex


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con·ca·vo-con·vex

(kŏn-kā′vō-kŏn-vĕks′)
adj.
Of or being concave on one surface and convex on the opposite surface.
References in periodicals archive ?
Achene 1.3-1.9 mm long, 0.8-1.1 mm wide, dark brown, obovate to elliptic-obovate, flattened-trigonous to more or less plano-convex or even slightly concavo-convex, more or less cuneate to a sessile base, rounded to the apex, finely papillose; style branches reddish, feathery with elongate papillae.
Precipitation of silica as overgrowth cement in pore spaces, presence of long and sutured boundaries, absence of concavo-convex and tangential contacts and alteration of feldspar grains to clay minerals are the prominent diagenetic modifications in the studied sandstone.