semipalmate

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

• adjective Having partial webbing between the toes, as in grouse and some waterbirds.

from The Century Dictionary.

• Half-webbed, as the toes of a bird; having partly webbed or imperfectly palmate feet, as a bird: applied to many species whose toes are webbed at the base only, or not more than half-way to their ends. Compare cuts under bicolligate and palmate.

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

• adjective (Zoöl.) Having the anterior toes joined only part way down with a web; half-webbed. See Illust. k under aves.

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

• adjective semipalmated