biconvex

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

convex on both sides;
shaped like a lentil
• Syn:
convexo-convex, lenticular, lentiform
• Similar to:
convex, bulging

• Từ đồng nghĩa / Synonyms:
  convexo-convex, lenticular, lentiform