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WordReference Random House Unabridged Dictionary of American English © 2024
ab?scis
′
ic ac
′
id
(ab sis
′
ik, -siz
′
-),
USA pronunciation
[
Biochem.
]
- Plant Biology, Biochemistry
a growth-regulating plant hormone, C
15
H
20
O
4
, that promotes dormancy and the aging and abscission of leaves.
- abscis
(
sion
) + -
ic,
on the model of the earlier name
abscisin
(see -
in
2
), coined in 1961
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