Definition of "diffusible" [dif•fu•si•ble]

• Capable of diffusing or of undergoing diffusion: diffusible dyes. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Beadle and Ephrussi designed at Caltech a set of experiments, involving transplantation of larval imaginal eye discs, to study the vermilion-plus hormone, as they called the diffusible substance."
• "We introduce morphogens -- diffusible signal molecules -- and adhesive proteins (both molecular components of our DPMs) or we knock these molecules down."
• "A gradient is a source of a morphogen, a diffusible product of the cells."