As an adjective seedling is
which is a seedling (see below).
As a noun seedling is
(botany) a young plant grown from seed.
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Not English
Wikidiffcom has no English definition. It may be misspelled. seedling
English
Noun
(
en noun)
(botany) A young plant grown from seed
Any young, especially
# one grown in a nursery for transplanting
# a tree smaller than a sapling.
References
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