en-

or em- or in-
pref.

1. 1. To put into or onto: encapsulate.
   2. To go into or onto: enplane.
2. To cover or provide with: enrobe.
3. To cause to be: endear.
4. Thoroughly. Used often as an intensive: entangle.

[Middle English, from Old French, from Latin in-, in.]

en-² or em-
pref.
In; into; within: enzootic.

[Middle English, from Latin, from Greek.]

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or em–
pref.

In; into; within: enzootic.