en·do·car·di·um 
(ĕn′dō-kärdē-əm)
(ĕn′dō-kärdē-əm)n. pl. en·do·car·di·a (-dē-ə)
The thin serous membrane, composed of endothelial tissue, that lines the interior of the heart.
[New Latin : ENDO- + Greek kardiā, heart; see kerd- in the Appendix of Indo-European roots.]
en′do·cardi·al adj.
- streptomycin
- streptonigrin
- streptothricin
- streptozocin
- streptozotocin
- Stresemann
- stress
- stressed-out
- stress fracture
- stressful
- stressfully
- stressfulness
- stress incontinence
- stressless
- stressor
- stress test
- stress urinary incontinence
- stretch
- stretchability
- stretchable
- stretch a point
- stretcher
- stretcher-bearer
- stretch legs
- stretch mark