The Collaborative International Dictionary of English v.0.48:

Protrude \Pro*trude"\, v. t. [imp. & p. p. Protruded; p. pr. &
   vb. n. Protruding.] [L. protrudere, protrusum; pro forward
   + trudere to thrust. See Threat.]
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   1. To thrust forward; to drive or force along. --Locke.
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   2. To thrust out, as through a narrow orifice or from
      confinement; to cause to come forth.
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            When . . . Spring protrudes the bursting gems.
                                                  --Thomson.
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