growth substance

noun

1. botany any substance, produced naturally by a plant or manufactured commercially, that, in very low concentrations, affects plant growth; a plant hormone

Example Sentences

It is a growth substance generated in the head which reaches the tissues through the skin.

From Time Magazine Archive

The use of growth substance powder did not significantly increase the "take".

From Project Gutenberg

HALLIBURTON, W. D., AND DRUMMOND, J. C.: The nutrition value of margarines and butter substitutes with reference to their content of the fat soluble accessory growth substance.

From Project Gutenberg