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An involucrum (plural involucra) is a layer of new bone growth outside existing bone.
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In cetaceans such as whales, it is a thick covering of bone over the middle-ear space.

Involvō (…)

1. I roll to or upon something.
2. I roll about, wrap up, envelop, involve; cover, overwhelm; curl, coil up; veil.
3. (figurative) I involve or devote myself to something.