pinnatiped

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

• adjective Having lobate toes. Used of birds.

from The Century Dictionary.

• Finfooted, as a bird; lobiped.
• noun One of the Pinnatipedes.

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

• noun (Zoöl.) Any bird which has the toes bordered by membranes.
• adjective (Zoöl.) Having the toes bordered by membranes; fin-footed, as certain birds.

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

• noun zoology Any bird which has the toes bordered by membranes.

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

• noun aquatic carnivorous mammal having a streamlined body specialized for swimming with limbs modified as flippers