Crossword Genius

Tube traveler? (4)

Ross

I believe the answer is:

ovum

'tube traveler?' is the definition.
(I've seen this in another clue)

This is all the clue.

(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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