- any of various cacti of the genus Mammillaria, including the pincushion cactus.
Origin of mammillaria
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for mammillaria
Like Mammillaria MacDougalii, the tubercles when injured exude a thick white milky fluid.The Fantastic Clan
John James Thornber