What does abscisic mean?
Abscisic is a technical adjective used almost entirely within botany and plant physiology to describe processes or substances connected with abscission — the natural shedding of leaves, flowers, fruits, or seeds by a plant. Its overwhelming use is in the fixed phrase 'abscisic acid', a key plant hormone discovered in the 1960s that governs seed and bud dormancy, promotes leaf fall, and helps plants survive drought by triggering the closure of stomata, the pores through which water escapes. Because of this role, abscisic acid is often informally called the plant 'stress hormone'. Outside scientific writing the word is essentially unknown, and even within it, 'abscisic' seldom appears alone: readers will meet it as part of discussions of hormone signalling, crop stress tolerance, and germination research. Its root lies in the Latin abscindere, meaning to cut off or tear away.
adjectiveRelating to or causing abscission, the natural shedding of leaves, flowers, fruit, or other plant parts. The term is used almost exclusively in the phrase 'abscisic acid', a plant hormone that regulates dormancy, stress responses, and leaf fall.
- Relating to abscission (the shedding of plant parts), especially in reference to abscisic acid, the plant hormone involved in dormancy, drought response, and leaf fall.
"Abscisic acid accumulates in the leaves during drought, prompting the stomata to close and conserve water."
"Researchers measured abscisic acid concentrations in the wheat plants to assess their drought tolerance."
"Seed dormancy in many species is maintained by high levels of abscisic acid until conditions favour germination."
The 'stress hormone' of the plant world: when drought hits, abscisic acid is the chemical signal that tells a leaf to shut its pores and hold on to every drop of water.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of abscisic
Abscisic derives from the Latin verb abscindere, meaning 'to cut off' or 'to tear away', formed from ab- ('away') and scindere ('to cut or split'). It entered scientific English via 'abscission', the botanical term for the deliberate separation of plant parts, and was coined in the 1960s when the hormone now called abscisic acid was identified — initially under names such as 'abscisin II' — for its role in promoting leaf fall and dormancy. Cognates from the same Latin root include 'abscission', 'abscise', and, more distantly, words built on scindere such as 'schism' (via Greek) and 'rescind'.
How abscisic is actually used
A technical term confined to botany and plant physiology; it is rarely encountered outside scientific literature and is overwhelmingly used attributively before the noun 'acid'.
Easily confused with abscisic
Abscission is the noun naming the process of a plant shedding its parts, while abscisic is the adjective describing things related to that process — most notably abscisic acid.