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Answer for the clue "Lead-in to nose or hair ", 3 letters:
bya

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Wikipedia Word definitions in Wikipedia
In astronomy , geology , and paleontology , " bya " or " b.y.a. " is an initialism for " billion years ago ". This abbreviation is commonly used as a unit of time to denote length of time before the present in billions of years. The "billion" in bya is, ...