Dendrology is the study of trees, and those who do the studying are called dendrologists. So dendroid describes something that "branches" in all directions from a central "trunk" in an irregular way. The word is almost always used by biologists, who often speak of dendroid seaweeds, dendroid moss, and dendroid algae.
Word History
Etymology
Greek dendroeidēs, from dendron
First Known Use
circa 1828, in the meaning defined above
Medical Definition
dendroid
adjective
den·droid ˈden-ˌdrȯid
: resembling a tree in form or in pattern of growth