- The corners of a stem of stemmed types or the corners of the base of triangular types which are ear-like.
- a heart chamber receiving blood from the circulation and pumping it into a ventricle
- Source: LITHICS-Net, Glossary of Lithics Terminology
- Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
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