Is “Nastic” a Scrabble word?
Yes
NASTIC
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 Nastic
adjective
1.Relating to the response of a plant to a stimulus that does not depend on the location of the stimulus.
“Many flowers close themselves at night. This nastic movement is in response to the brightness of the sky.”