hy·dro·ni·um 
(hī-drōnē-əm)
(hī-drōnē-əm)n.
A hydrated hydrogen ion, H3O+. Also called hydronium ion.
[HYDR(O)- + (AMM)ONIUM.]
- behead
- beheld
- behemoth
- behest
- behind
- behind back
- behind bars
- behindhand
- behind (one's) back
- behind one's back
- behind the eight ball
- behind-the-scenes
- behind the scenes
- behind the times
- behind the wheel
- Behn
- be hoist with one's own petard
- behold
- beholden
- beholder
- save (one's) breath
- save one's breath
- saver
- savin
- savine