Fastigiate definitions

-ē-ā'tĭd
Having erect, clustered, almost parallel branches, as in the Lombardy poplar.
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Having a narrow, spirelike shape, as certain kinds of trees.
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(botany) Erect and parallel.

The branches of this species are fastigiate.

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(botany, horticulture) Having closely-bunched erect parallel branches.

This is a fastigiate variety.

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(palynology) Characterized by a fastigium, a cavity separating the intexine from the sexine near the endoaperture of a colporate pollen grain.

The grains are 3-colporate and fastigiate.

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(horticulture) A tree or shrub with erect, parallel branches.
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Origin of fastigiate

Medieval Latin fastīgiātus high from Latin fastīgium apex, height