Concavo-concave Definition

kŏn-kāvō-kŏn-kāv
adjective
Concave on both sides, as some lenses.
Webster's New World
Part or all of this entry has been imported from the 1913 edition of Webster's Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
Wiktionary
Synonyms: