ectomycorrhiza
Technical term in botany for a symbiotic association between a fungus and the roots of a plant, where the fungus forms a sheath around the root.
Ectomycorrhizae form on the roots of pine trees.
Endomycorrhiza, where the fungus penetrates the root cells, unlike ectomycorrhiza which forms an external sheath.
Compound of 外生 (gai-sei, 'external') + 菌根 (kin-kon, 'mycorrhiza'). The term is a direct translation of the English 'ectomycorrhiza'.