GROOVE, PRIMITIVE
\ɡɹˈuːv], \ɡɹˈuːv], \ɡ_ɹ_ˈuː_v]\
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Primitive streak or trace, Nota primitiva. A bright streak in the long axis of the pellucid part of the area germinativa, after it presents a central pellucid and a peripheral opake part, and passes from the round to the pear shape.
By Robley Dunglison