Fallopian tube traveler (4)

I think it could be either:

Which length description are you looking for?:

ovum

'fallopian 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 gamete" , "Reproductive cell, 'egg' in Latin" , "Female reproductive cell" , "bit of life potentially" , "A female egg-cell" .)

I've seen this clue in The Wall Street Journal and The New York Times.

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