verb (used without object), verb (used with object), interdigitated, interdigitating.
to interlock, as or like the fingers of both hands.

1840–50; inter- + digitate

interdigitation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
interdigitate (ˌɪntəˈdɪdʒɪˌteɪt)
(intr) to interlock like the fingers of clasped hands
[C19: from inter- + Latin digitus (see digit) + -ate1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

interdigitation in·ter·dig·i·ta·tion (ĭn'tər-dĭj'ĭ-tā'shən)

  1. The interlocking of toothed or tonguelike processes.

  2. The processes thus interlocked.

  3. Infoldings of adjacent cell or plasma membranes.

  4. See intercuspation.

The American Heritage® Stedman's Medical Dictionary
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