mor·pho·gen 
(môrfō-jĕn′)
(môrfō-jĕn′)n.
Any of various chemicals in embryonic tissue that influence the movement and organization of cells during morphogenesis by forming a concentration gradient.
- trigger
- triggerfish
- trigger-happy
- triggerman
- trigly
- triglyceride
- triglyph
- triglyphic
- trigness
- trigon
- trigonal
- trigonometric
- trigonometrical
- trigonometrically
- trigonometric function
- trigonometry
- trigram
- trigrammatic
- trigrammatically
- trigraph
- trigraphic
- trigraphically
- trihalomethane
- trihedral
- trihedron