- X USE xenon
- X factor USE barrier-free design
- x ray diffraction USE x-ray diffraction
- x ray fluorescence USE x-ray fluorescence
- x ray scattering USE x-ray scattering
- X sheet USE dope sheets
- X sheets USE dope sheets
- X-chair USE X-chairs
- X-chairs
- X-radiograph USE x-radiographs
- x-radiograph USE x-radiographs
- x-radiographs
- X-radiographs USE x-radiographs
- x-radiography USE x-radiography
- X-radiography USE x-radiography
- x-radiography
- X-ray USE x-ray
- x-ray (radiation)
- X-ray USE X-ray style
- x-ray absorbance spectroscopy USE x-ray absorption spectroscopy
- x-ray absorbing glass USE x-ray protective glass
- x-ray absorption near-edge structure
- x-ray absorption spectroscopy
- x-ray cabinet USE x-ray cabinets
- x-ray cabinets
- x-ray computed laminography USE computed x-ray laminography
- x-ray computed micro-tomography USE x-ray microtomography
- x-ray computed microtomography USE x-ray microtomography
- x-ray diffraction
- x-ray duplicator USE x-ray duplicators
- x-ray duplicators
- x-ray emissiography
- x-ray emission, particle-induced USE particle-induced x-ray emission
- x-ray excited optical luminescence
- X-ray facilities
- X-ray facility USE X-ray facilities
- x-ray fluorescence
- x-ray fluorescence spectrometry USE x-ray spectroscopy
- x-ray fluorescence spectroscopy USE x-ray spectroscopy
- x-ray holder USE x-ray holders
- x-ray holders
- x-ray micro-diffraction USE micro x-ray diffraction
- x-ray microtomography
- x-ray optics
- x-ray photoelectron spectroscopy
- x-ray photographs USE radiographs
- x-ray photography USE radiography
- x-ray powder diffraction
- x-ray protective glass
- x-ray rejecting glass USE x-ray protective glass
- x-ray resistant glass USE x-ray protective glass
- X-ray rooms USE X-ray facilities
- x-ray scattering
- x-ray security scanner USE x-ray security scanners
- x-ray security scanners
- x-ray shield USE x-ray shields
- x-ray shields
- x-ray spectrography USE x-ray spectroscopy
- x-ray spectrometry USE x-ray spectroscopy
- x-ray spectrometry, energy dispersive USE energy dispersive x-ray spectrometry
- x-ray spectroscopy
- X-ray style
- x-ray viewer USE x-ray viewers
- x-ray viewers
- x-rays USE x-ray
- X-rays USE x-ray
- x-rays USE radiographs
- X-shape USE X-shaped
- X-shaped
- X-shaped chairs USE X-chairs
- X-shaped legs USE curule legs
- X-stools USE X-chairs
- X-stretchers USE cross stretchers
- xac USE Kachari
- Xadi USE Hide
- xahcalli
- xakwl’l shál USE soapberry spoons
- xal USE Kalmyk
- xalams USE khalams
- Xananwa USE Hananwa
- XANES USE x-ray absorption near-edge structure
- xanthan gum
- xanthic oxide USE xanthine
- xanthine (color)
- xanthine (animal material)
- Xanthorrhoea USE Asphodelaceae
- xanthorrhoea USE acaroid resin
- xanthorrhoea resin USE acaroid resin
- xantil USE xantiles
- xantiles
- xantils USE xantiles
- xao USE Khao
- Xaracuu (language)
- Xaragure (language)
- XAS USE x-ray absorption spectroscopy
- Xasonke USE Khassonke
- Xasso USE Khassonke
- xaw USE Kawaiisu
- Xdi USE Hide
- Xe (Maya culture or period)
- Xe USE xenon
- Xedi USE Hide
- Xenarthra (subclass)
- xenarthrans USE Xenarthra
- xenodocheion USE xenodochia
- xenodocheum USE xenodochia
- xenodochia
- xenodochion USE xenodochia
- xenodochium USE xenodochia
- xenon
- xenon arc lamps USE xenon lamps
- xenon lamp USE xenon lamps
- xenon lamps
- XEOL USE x-ray excited optical luminescence
- xeriscape USE xeriscapes
- Xeriscape USE xeriscapes
- xeriscape gardens USE xeriscapes
- xeriscapes
- xerographic art USE copy art
- xerographic copies
- xerographic copy USE xerographic copies
- xerographic process USE xerography
- xerography
- xeroradiography
- Xerox (TM) art USE copy art
- xeroxing USE xerography
- Xestobium (genus)
- Xestobium rufovillosum (species)
- xguthe USE ramkies
- xh USE Xhosa
- xho USE Xhosa
- Xhosa (language)
- Xhosa (culture or style)
- Xi Xia USE Xixia
- Xi'an USE Western Zhou
- Xia (ancient culture, style, period)
- Xia (Sixteen Kingdoms, culture, style, period)
- xian USE yan
- xian1251 USE Chinese, Xiang
- Xianbei (culture or style)
- Xiandaohua (language)
- Xianfeng
- Xiang USE Chinese, Xiang
- Xiang Chinese USE Chinese, Xiang
- Xiangxi (language)
- xiao
- Xiaotun
- Xibe (language)
- xicalcoliuhqui USE stepped frets
- Xicaque USE Jicaque
- xicolli (sleeveless tunic)
- xie
- xiēshān
- xiēshān zhuǎnjiǎo
- xieyi
- xihuitl (solar year)
- XIIIth Dynasty USE Thirteenth Dynasty
- XIIth Dynasty USE Twelfth Dynasty
- Ximba USE Himba
- Ximen USE Peking
- Xing (Chinese ceramics style)
- Xinges USE Shinji
- Xingú
- Xinje USE Shinji
- Xinji USE Shinji
- xīnjiān
- Xinle
- Xiongnu (culture and period)
- Xionite USE Chionite
- Xiphias (genus)
- Xiphias gladius (species)
- Xiphiidae (family)
- xirimías USE chirimías
- Xironga USE Ronga
- XIth Dynasty USE Eleventh Dynasty
- xittomonalli
- xiuhahtlatl
- xiuhhuitzolli
- xiuhmolpilli (Nahua calendar)
- xiuhpohualli (year Nahua calendar)
- xiuhzālōliztli USE xiuhzaloliztli
- xiuhzaloliztli
- xiulas USE chûrulas
- XIVth Dynasty USE Fourteenth Dynasty
- Xixia
- XIXth Dynasty USE Nineteenth Dynasty
- xkv USE Kgalagadi
- xmf USE Mingrelian
- xmj USE Majera
- xml USE XML
- XML
- xnt USE Narragansett
- xoana
- xoanon USE xoana
- xochimilca USE xochimilcas
- xochimilca USE xochimilcatl
- xochimilcas
- xochimilcas USE xochimilcatl
- xochimilcatl (style, culture)
- Xochitl (Day Sign)
- Xocotl Huetzi (veintena)
- Xolalpan
- xoloitzcuintle USE xoloitzcuintlis
- xoloitzcuintli USE xoloitzcuintlis
- xoloitzcuintlis (breed)
- xolos USE xoloitzcuintlis
- Xometla USE Coyotlatelco
- xomsa USE khamsa
- xopilli (toe or claw device)
- Xosa USE Xhosa
- XPS USE x-ray photoelectron spectroscopy
- XRD USE x-ray diffraction
- XRF USE x-ray fluorescence
- XRPD USE x-ray powder diffraction
- xsi USE Sio
- Xth Dynasty USE Tenth Dynasty
- xu (ritual vessels)
- xuan
- Xuan De USE Xuande
- Xuan paper
- Xuande
- Xuantong
- Xun (language)
- XVIIIth Dynasty USE Eighteenth Dynasty
- XVIIth Dynasty USE Seventeenth Dynasty
- XVIth Dynasty USE Sixteenth Dynasty
- XVth Dynasty USE Fifteenth Dynasty
- xwl USE Xwla-Gbe
- Xwla-Gbe (language)
- XXIIIrd Dynasty USE Twenty-third Dynasty
- XXIInd Dynasty USE Twenty-second Dynasty
- XXIst Dynasty USE Twenty-first Dynasty
- XXIVth Dynasty USE Twenty-fourth Dynasty
- XXIXth Dynasty USE Twenty-ninth Dynasty
- XXth Dynasty USE Twentieth Dynasty
- XXVIIIth Dynasty USE Twenty-eighth Dynasty
- XXVIIth Dynasty USE Twenty-seventh Dynasty
- XXVIth Dynasty USE Twenty-sixth Dynasty
- XXVth Dynasty USE Twenty-fifth Dynasty
- XXXIst Dynasty USE Thirty-first Dynasty
- XXXth Dynasty USE Thirtieth Dynasty
- xylene
- xylenes USE xylene
- xylographica USE block books
- xylographs USE woodcuts
- xylographs USE wood engravings
- xylography
- xylophagan USE xylophages
- xylophage USE xylophages
- xylophages
- xylophone USE xylophones
- xylophone hammer USE xylophone hammers
- xylophone hammers
- xylophones
- xylophones, log USE log xylophones
- [xylophones: gourd-resonated]