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List of 13-letter words beginning with

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There are 18 thirteen-letter words beginning with X

XANTHOCHROIAS• XANTHOCHROIA n. yellowness of the skin.
XANTHOCHROIDS• xanthochroids n. Plural of xanthochroid.
• XANTHOCHROID n. a blond-haired and blue eyed person with fair white skin.
XANTHOCHROISM• xanthochroism n. Alternative form of xanthochromism.
• XANTHOCHROISM n. a condition in which all skin pigments except yellow disappear.
XANTHOCHROMIA• xanthochromia n. (Medicine) The yellowish appearance of cerebrospinal fluid that accompanies certain conditions, especially…
• XANTHOCHROMIA n. any yellowish discoloration, esp. of the cerebrospinal fluid.
XANTHOCHROOUS• xanthochroous adj. Yellow‐skinned; of or pertaining to Xanthochroi.
• XANTHOCHROOUS adj. exhibiting xanthochroism, a condition in which all pigments other than yellow disappear, also XANTHOCHROIC.
XANTHOPTERINE• xanthopterine n. Alternative form of xanthopterin.
• XANTHOPTERINE n. a yellow pigment obtainable from the wings of yellow butterflies and the urine of mammals, also XANTHOPTERIN.
XANTHOPTERINS• xanthopterins n. Plural of xanthopterin.
• XANTHOPTERIN n. a yellow pigment obtainable from the wings of yellow butterflies and the urine of mammals, also XANTHOPTERINE.
XENODIAGNOSES• xenodiagnoses n. Plural of xenodiagnosis.
• XENODIAGNOSIS n. the detection of a parasite (as of humans) by feeding a suitable intermediate host (as an insect) on supposedly infected material (as blood) and later examining the host for the parasite.
XENODIAGNOSIS• xenodiagnosis n. (Medicine) diagnosis of an infectious disease (especially of trypanosomiasis) by exposure to a vector…
• XENODIAGNOSIS n. the detection of a parasite (as of humans) by feeding a suitable intermediate host (as an insect) on supposedly infected material (as blood) and later examining the host for the parasite.
XERODERMATOUS• xerodermatous adj. Exhibiting or relating to xeroderma.
• XERODERMATOUS adj. suffering from xeroderma, morbid dryness of skin.
XEROPHTHALMIA• xerophthalmia n. (Ophthalmology) A condition due to a deficiency of vitamin A where the conjunctiva and cornea become…
• XEROPHTHALMIA n. extreme dryness of the conjunctive, thought to stem from a vitamin A deficiency, also XEROMA.
XEROPHTHALMIC• xerophthalmic adj. Of or pertaining to xerophthalmia.
• XEROPHTHALMIC adj. relating to xerophthalmia.
XIPHIPLASTRAL• xiphiplastral adj. Relating to a xiphiplastron.
• XIPHIPLASTRAL n. a type of chelonian.
XIPHIPLASTRON• xiphiplastron n. The posterior, or fourth lateral plate in the plastron of a turtle.
• XIPHIPLASTRON n. in chelonians, one of the plates forming the plastron, lying posterior to the hypoplastron.
XIPHISTERNUMS• xiphisternums n. Plural of xiphisternum.
• XIPHISTERNUM n. the posterior and smallest of the three divisions of the sternum.
XIPHOPHYLLOUS• xiphophyllous adj. (Botany) Having sword-shaped leaves.
• XIPHOPHYLLOUS adj. having sword-shaped leaves.
XYLOBALSAMUMS• XYLOBALSAMUM n. the dried twigs, or the wood, of the balm of Gilead tree.
XYLOGRAPHICAL• xylographical adj. Xylographic.
• XYLOGRAPHICAL adj. relating to xylography, the art of making engravings on wood, also XYLOGRAPHIC.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the 1Word.ws and WikWik.org.

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