9-letter words that end in um
- vaccinium — a member of a shrub genus including blueberries and cranberries
- vestigium — a vestigial structure of any kind; vestige.
- virginium — (formerly) francium. Symbol: Vi.
- vitallium — a corrosion-resistant alloy of cobalt, chromium, and molybdenum, used for dentures, in bone surgery and prosthetics, in castings, etc.
- viticetum — a place where vines, especially grapevines, are cultivated.
- wap forum — (body) The official body developing Wireless Application Protocol.
- water gum — any of several Australian trees of the myrtle family, growing near water.
- white gum — any of various Australian eucalyptuses having a whitish bark.
- xtp forum — (body) A consortium of for- and non-profit companies and research organisations promoting Xpress Transport Protocol.
- ytterbium — a rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb; atomic weight: 173.04; atomic number: 70; specific gravity: 6.96.
- zirconium — a metallic element found combined in zircon, baddeleyite, etc., resembling titanium chemically: used in steel metallurgy, as a scavenger, as a refractory, and as an opacifier in vitreous enamels. Symbol: Zr; atomic weight: 91.22; atomic number: 40; specific gravity: 6.49 at 20°C.
- zoocytium — the outer sheath or branched support of colonies of some social minute aquatic creatures
- zygantrum — a part linking the vertebral segments of the body in snakes and some lizards and into which fits the zygosphene