Is “Heliotropism” a Scrabble word?
Yes
HELIOTROPISM
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Heliotropism
noun
1.The property of some plants of turning under the influence of light; either positively (towards the light) or negatively (away from the light)