gra·vit·ro·pism 
(grə-vĭtrə-pĭz′əm)
(grə-vĭtrə-pĭz′əm)n.
Growth or movement of a sessile organism in response to gravity, as the downward growth of plant roots. Also called geotropism.
[GRAVI(TY) + -TROPISM.]
grav′i·tropic (grăv′ĭ-trōpĭk) adj.
- submissiveness
- submit
- submittal
- submitter
- submontane
- submucosa
- submucosal
- submucosally
- submultiple
- subnet
- subnormal
- subnormality
- subnotebook
- subnuclear
- suboceanic
- suborbital
- suborder
- subordinate
- subordinate clause
- subordinate conjunction
- subordinately
- subordinateness
- subordination
- subordinative
- suborn