from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Arranged or occurring in pairs; twin.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Twin, twinned; growing or occurring in pairs.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Growing in pairs or twins.

from The Century Dictionary and Cyclopedia

  • In botany, twofold; twin; growing double, as the fruits of umbelliferous plants, the anthers of bedstraw, or the tubers of some orchids.
  • In zoology, twain; paired: applied to two spots, spines, tubercles, etc., when they form a pair touching each other.


From Greek didumos, twin; see dwo- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Modern Latin, from Ancient Greek δίδυμος ("twin"). (Wiktionary)



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