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half-line

[haf-lahyn, hahf-] /ˈhæfˌlaɪn, ˈhɑf-/
noun, Mathematics
1.
ray1 (def 7b).
Origin
1910-1915
1910-15
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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