1) Auxin 2) Auxinic 3) Cytokinin 4) Gibberellin 5) Kinin 1) Growth regulator 2) Plant hormone 3) Plant product 
Synonym for plant growth substances ... <plant biology> Substances that, at low concentration, influence plant growth and differentiation. Formerly referred to as plant hormones or phytohormones, these terms are now suspect because some aspects of the hormone concept, notably action at a distance from the site of synthesis, do not necessarily...
[n] - a hormone-like plant product
plant hormone noun (botany) a plant product that acts like a hormone