ul- or ule- or ule- or ulo- [from Greek oulon the gums] The gums (ulocace).
ultra- [Latin ultra beyond, further, more, on the other side] Beyond, in excess, extreme (ultracentrifuge).
uln- or ulno- [from Latin ulna forearm] Relating to the ulna (ulnocarpal).
un- [Germanic equivalent of Latin un- and Greek an-] Not, opposite, deprived of (unossified).
unci- [from Latin uncus hook] Hook, hooked (uncinate). Compare: onci-.
uni- [from Latin unus one] One, single (univalent).
ur- or uro- [from Greek oura tail] Tail, taillike, posterior region (Urodela).
ureter- or uretero- [from Greek oureter ureter] Denotes the ureter(s) (ureteralgia).
urin- or urino- or uro- [from Greek ouron urine] Urine (urinoscopy).
vagin- or vagino- [from Latin vagina sheath, scabbard] Denotes the vagina (vaginitis).
vas- or vaso- [from Latin vas vessel, dish, vase] Vessel (vasodepressant).
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ventr- or ventri- or ventro- [from Latin venter, ventris stomach, belly, womb] (1) relating to the abdomen; (2) relating to the lower surface (ventrolateral).
vill- or villi- or ventro- [from Latin villus shaggy hair] Denotes a villus or villi (villiform, vilosity).
xanth- or xantho- [from Greek xanthos yellow] Yellow (xanthous).
xen- or xeno- [from Greek xenos stranger, foreigner] Foreign, strange, intruding (xenograft).
xer- or xero- [from Greek xeros dry] Dry (xeric).
xiphi- or xipho- [from Greek xiphos sword] Denotes the xiphoid process (xiphocostal).
xyl- or xylo- [from Greek xylon wood] Wood (xylem).
yocto- [prefix in International System of Units] 10-24 (yoctogram).
yotta- [prefix in International System of Units] 1024 (yottaFLOPS).
zepto- [prefix in International System of Units] 10-21 (zeptomole).
zeta- [prefix in International System of Units] 1021 (zetaFLOPS).
zo- or zoo- [from Greek zoon animal] (1) of or relating to animals (zoology); (2) capable of movement (zoocytium).
zyg- or zygo- [from Greek zygon yoke, tying element] Union, fusion, yoking (zygote).
zym- or zymo- [from Greek zymosis fermentation] Ferment, enzyme (zymogenesis).
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