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Latin verticillus (a whirl) + aster (a star).


verticillaster (plural verticillasters)

  1. (botany) A whorl of flowers apparently of one cluster, but composed of two opposite axillary cymes, as in mint.

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 The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for verticillaster in
Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)