A unicellular or multicellular plant structure (PO:0009011) that forms a non-sclerified outgrowth from the epidermis (PO:0005679). [source: PMID:19939948, POC:curators]
Comment
This class is the union of unicellular trichome (PO:0025537) and multicellular trichome (PO:0025162). A trichome can vary in length and shape and may be branched or unbranched. It may be glandular or non-secretory.