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SchwarzschildRadius
Well,

One could add many different prefixes to tropism to get various results.

Photos + tropos = Phototropism = Turning toward the light.

Gravi + tropos = Gravitropism = Turning toward gravity, a.k.a. turning downwards.  Plant stems exhibit negative gravitropism, as they grow upwards, against gravity.  I would call it "graviphobia."

Hydro + tropos = Hydrotropism = Turning toward water.  This is exhibited by plants' roots growing toward water.

Those are the ones that you can look up in a dictionary and find as legit words.  These are ones I have just made up, but still make sense (to some degree).

Helio + tropos = Heliotropism = Turning toward the sun.  Synonymous with phototropism.

Claudo + tropos = Claustropism = Turning toward enclosed spaces.  Sounds silly, but that's what you do to go into an elevator.  Synonymous with claustrophilia.

Caput + tropos = Caputropism = Turning toward the head.  That's what everyone does when they face the leader of their group.

Astra/stella + tropos = Astrotropism/Stellatropism = Turning toward the star.  Basically stargazing.
soundofstringsbysury

Tropism is a response to certain stimuli. A positive tropism is moving towards the stimuli, while a negative tropism is moving away from a stimuli.

Positive Phototropism - Growing towards light

Negative Phototropism - Growing away from light

Positive Thigmotropism- Moving towards touch

Negative Thigmotropism- Moving away from touch

Positive Hydrotropism - Growing towards water

Negative Hydrotropism - Growing away from water

Positive Gravitropism - Growing towards ground

Negative Gravitropism - Growing upwards

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