excurrent

[ik-skur-uhnt, -skuhr-]
adjective
1.
running out or forth.
2.
Zoology. giving passage outward; affording exit: the excurrent canal of certain sponges.
3.
Botany.
a.
having the axis prolonged so as to form an undivided main stem or trunk, as the stem of the spruce.
b.
projecting beyond the apex, as the midrib in certain leaves.

Origin:
1595–1605; < Latin excurrent- (stem of excurrēns) present participle of excurrere to run forth. See ex-1, current

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World English Dictionary
excurrent (ɛkˈskʌrənt)
 
adj
1.  zoology having an outward flow, as certain pores in sponges, ducts, etc
2.  botany
 a.  (of veins) extending beyond the margin of the leaf
 b.  having an undivided main stem or trunk, as the spruce and other conifers
3.  flowing or running in an outward direction
 
[C19: from Latin excurrere to run forth; see excursion]

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Example sentences
Many conifers have an excurrent branching pattern, and many resist ice storm
  damage.
By combining the excurrent water of many zooids, a sufficient current is
  produced to carry these products away.
The particle-free water is then discharged out the excurrent siphon.
Trees with a natural excurrent growth form will have only one main branch
  leader.
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