Crossword Genius

Tube traveler? (4)

Ross

I believe the answer is:

ovum

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tube traveler?</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for ovum that I've seen before include "Female reproductive cell" , "Female gamete" , "Reproductive cell, 'egg' in Latin" , "Human egg cell" , "A female egg-cell" .)

I've seen this clue in The New York Times.
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