pro·to·corm
| \ ˈprōtə+ˌ- \
Definition of protocorm
1
: a tuber-shaped body with rhizoids that is produced by the young seedlings of various orchids and some other plants having associated mycorrhizal fungi
2
[prot- + -corm (from New Latin cormus)]
: the part of an insect embryo posterior to the protocephalon
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Merriam-Webster unabridged
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