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From French ligne from Latin linea, 'thread', 'line', from linum, 'flax' ultimately from the Indo-European lino- ????
Related mathematical terms
Other related words
lineage, align (realign, etc.). Other relatives connected with the 'flax' sense: linen, lingerie, linoleum, crinoline, linseed, lint, and lining meaning the covering to the inside surface of...