nim·bo·strat·us 
(nĭm′bō-strătəs, -strātəs)
(nĭm′bō-strătəs, -strātəs)n.
A low, gray, often dark cloud that precipitates rain, snow, or sleet.
[NIMB(US) + STRATUS.]
nimbostratus- chromium
- chromium picolinate
- chromo
- chromo-
- chromodynamics
- chromogen
- chromogenic
- chromolithograph
- chromolithographer
- chromolithographic
- chromolithography
- chromomere
- chromomeric
- chromonema
- chromonematic
- chromonemic
- chromophil
- chromophobe
- chromophobic
- chromophore
- chromophoric
- chromoplast
- chromoprotein
- chromosomal
- chromosomally