What does dicotyl mean?
A "dicotyl" is a rare, largely obsolete short form of "dicotyledon," denoting a flowering plant whose embryo bears two seed leaves, known as cotyledons. The group — now more commonly called dicots or dicotyledons — includes many familiar plants such as oaks, roses, beans, and sunflowers, and is distinguished from the monocots, whose embryos have only a single seed leaf. Beyond this embryological trait, dicots traditionally show features such as net-veined leaves and floral parts often arranged in fours or fives. In contemporary usage the word appears almost exclusively in older botanical literature; modern science prefers "dicot" for brevity or "dicotyledon" for precision. For readers, encountering "dicotyl" signals a text from an earlier era of botany, and understanding it requires no more than recognizing it as a compact synonym of the standard terms still in everyday scientific use.
nounA rare or obsolete term for a dicotyledon: a flowering plant whose embryo has two seed leaves (cotyledons). It is now almost entirely replaced in botanical usage by "dicot" or "dicotyledon."
- A flowering plant belonging to the group characterized by embryos with two cotyledons (seed leaves); a dicotyledon.
"The botanist's field notes classified every seedling as either a dicotyl or a monocot."
"In her notebook she sorted each germinating seedling into a dicotyl and a monocot column."
"Older botany texts occasionally refer to what we now call dicots by the shorter form "dicotyl.""
Forms its plural regularly by adding -s.
"The old textbook grouped all the dicotyls together in a single chapter."
Every oak, rose, and bean you've ever seen began life with two tiny seed leaves — which is exactly what the name "dicotyl" literally records.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of dicotyl
The word derives from Greek elements via Latinized scientific nomenclature: "di-" meaning "two" and "cotyledon," from Greek kotyledon, denoting a seed leaf or cup-shaped hollow. The full form "dicotyledon" was adopted in botanical classification to describe plants with two embryonic seed leaves, and "dicotyl" arose as a clipped variant of that term. Its sibling coinage "monocotyledon" (and its shortenings) was formed on the same root with the prefix meaning "one."
How dicotyl is actually used
This is an archaic or very rare shortened form; modern botanical writing uses "dicot" or "dicotyledon" instead. Readers should expect to encounter it mainly in older literature.
Easily confused with dicotyl
"Dicotyl" is simply a shortened variant of the fuller term "dicotyledon," which is the standard botanical name for the same group of plants.
A "monocotyl" has one seed leaf in its embryo, whereas a "dicotyl" characteristically has two.