in·ter·lude 
(ĭntər-ld′)
(ĭntər-ld′)n.
1. An intervening episode, feature, or period of time: "Kerensky has a place in history, of a brief interlude between despotisms" (William Safire).
2.
a. A short farcical entertainment performed between the acts of a medieval mystery or morality play.
b. A 16th-century genre of comedy derived from this.
c. An entertainment between the acts of a play.
3. Music A short piece inserted between the parts of a longer composition.
[Middle English enterlude, a dramatic entertainment, from Old French entrelude, from Medieval Latin interlūdium : Latin inter-, inter- + Latin lūdus, play; see leid- in the Appendix of Indo-European roots.]
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- ultrasonographer