1. 
   Deltidium
   Del·tid'i·um noun [ New Latin , from Greek de`lta , the letter Δ.] (Zoology) The triangular space under the beak of many brachiopod shells.
   Found op http://www.encyclo.co.uk/webster/D/31
   
   
2. 
   deltidium
   <zoology> The triangular space under the beak of many brachiopod shells. ... Origin: NL, fr. Gr. Delta, the letter <DELTA/. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?deltidium
   
   
3. 
   Deltidium
   • (n.) The triangular space under the beak of many brachiopod shells.
   Found op http://thinkexist.com/dictionary/meaning/deltidium/
   
   

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