os 2 
(ŏs)
(ŏs)n. pl. os·sa (ŏsə)
A bone.
[Latin, bone; see ost- in the Appendix of Indo-European roots.]
- streetwalker
- streetwalking
- streetwise
- strength
- strengthen
- strengthener
- strenuous
- strenuously
- strenuousness
- strep
- strepsirhine
- strepsirrhine
- strep throat
- strepto-
- streptobacillus
- streptocarpus
- streptococcal
- streptococcic
- streptococcus
- streptodornase
- streptokinase
- streptolysin
- streptomyces
- streptomycin
- streptonigrin