bracteole

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A small bract.

from The Century Dictionary.

• noun In botany, a little bract situated on a partial flower-stalk or pedicel, between the bract and the calyx, and usually smaller than the true bract. Also called bractlet. See cut under bract.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Bot.) Same as bractlet.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun botany A small leaf of leaf-like structure directly subtending a flower or inflorescence whose stalk itself is subtended by a bract.
• noun botany A bract subtending an individual flower rather than an inflorescence.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a small bract