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Dictionary Meaning and Definition on 'Dicotyledon'

Dicotyledon Meaning and Definition from WordNet (r) 2.0
    dicotyledon n : flowering plant with two cotyledons; the stem grows by deposit on its outside [syn: dicot, magnoliopsid, exogen]
Dicotyledon Meaning and Definition from Webster's Revised Unabridged Dictionary (1913)
    Dicotyledon \Di*cot`y*le"don\, n. [Pref. di- + cotyledon.] (Bot.) A plant whose seeds divide into two seed lobes, or cotyledons, in germinating.
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Wikipedia Meaning and Definition on 'Dicotyledon'

The dicotyledons, also known as dicots, are a group of flowering plants whose seed typically has two embryonic leaves or cotyledons. There are around 199,350 species within this group. Flowering plants that are not dicotyledons are monocotyledons, typically having one embryonic leaf.

Dicotyledons are not a monophyletic group, and therefore the names "dicotyledons" and "dicots" are, strictly speaking, deprecated. However, the vast majority of "dicots" do form a monophyletic group called the eudicots or tricolpates. These may be distinguished from all other flowering plants by the structure of their pollen. Other dicotyledons and monocotyledons have monosulcate pollen, or forms derived from it, whereas eudicots have tricolpate pollen, or derived forms, the pollen having three or more pores set in furrows called colpi.

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