(1) An undifferentiated part of a perianth that cannot be distinguished as a sepal or a petal (as in lilies and tulips)
WiktionaryText
English
Etymology
From , from , by transposition.
Noun
One of the component parts of the perianth, the outermost whorls of flower parts, especially when the perianth is not divided into two whorls of unequal appearance.
