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dors-umbonal
dors-umbonal adj.
Brit. 
/dɔːsˈʌmbənl/
, /dɔːsˈʌmbənl/U.S. /dɔrsˈəmbən(ə)l/
‘both dorsal and umbonal, as one of the accessory valves in the family Pholadidæ’ (Cent. Dict.). [After German dorsumbonal (1862 or earlier).] /dɔrsˈəmbən(ə)l/ΚΠ
1883 E. R. Lankester in Encycl. Brit. XVI. 687/2 In Pholas dactylus we find a pair of umbonal plates, a dors-umbonal plate and a dorsal plate.
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