pinnatiped

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Having lobate toes. Used of birds.

Century Dictionary and Cyclopedia

1. Finfooted, as a bird; lobiped.
2. n. One of the Pinnatipedes.

Wiktionary

1. n. zoology Any bird which has the toes bordered by membranes.

GNU Webster's 1913

1. adj. (Zoöl.) Having the toes bordered by membranes; fin-footed, as certain birds.
2. n. (Zoöl.) Any bird which has the toes bordered by membranes.

WordNet 3.0

1. n. aquatic carnivorous mammal having a streamlined body specialized for swimming with limbs modified as flippers