noun Botany.
an inflorescence in which a number of flower stalks or pedicels, nearly equal in length, spread from a common center.

1590–1600; < Latin umbella a sunshade, parasol, derivative of umbra shadow, shade; for formation see castellum Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
umbel (ˈʌmbəl)
an inflorescence, characteristic of umbelliferous plants, in which the flowers arise from the same point in the main stem and have stalks of the same length, to give a cluster with the youngest flowers at the centre
[C16: from Latin umbella a sunshade, from umbra shade]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
umbel   (ŭm'bəl)  Pronunciation Key 
A flat or rounded indeterminate inflorescence in which the individual flower stalks (called pedicels) arise from about the same point on the stem at the tip of the peduncle. The geranium, milkweed, and onion have umbels. Umbels usually show centripetal inflorescence, with the lower or outer flowers blooming first.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Its bloom is an inconspicuous, yellow-green umbel near the top of the stem.
Flowers are borne in an umbel and are surrounded by yellowish-green showy
The successive segments of the stem become progressively shorter bearing a
  terminal umbel of racemes.
The small, yellowish-green flowers are borne in an umbel on a short stalk above
  the leaves and develop into bright red berries.
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