he·li·o·tax·is 
(hē′lē-ō-tăksĭs)
(hē′lē-ō-tăksĭs)n.
The movement of an organism in response to the light of the sun.
he′li·o·tactic (-tăktĭk) adj.
- microchip
- microcircuit
- microcircuitry
- microcirculation
- microcirculatory
- microclimate
- microclimatic
- microclimatologic
- microclimatological
- microclimatology
- microcline
- micrococcal
- micrococcus
- microcomputer
- microcopy
- microcosm
- microcosmic
- microcosmical
- microcosmically
- microcosmic salt
- microcredit
- microcrystal
- microcrystalline
- microculture
- microcyte