from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A secondary involucre, as at the base of an umbel within a compound umbel.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An involucre that forms at the base of a flower cluster within a compound inflorescence.
from the GNU version of the Collaborative International Dictionary of English
- n. A partial, secondary, or small involucre. See Illust. of involucre.
from The Century Dictionary and Cyclopedia
- n. In botany, a secondary involucre in a compound cluster of flowers, as in many of the Umbelliferæ. See cut under inflorescence (fig. 9).
New Latin involūcellum, diminutive of involūcrum, involucre; see involucrum.(American Heritage® Dictionary of the English Language, Fourth Edition)