AskDefine | Define velum

Dictionary Definition

velum

Noun

1 membrane of the young sporophore of various mushrooms extending from the margin of the cap to the stem and is ruptured by growth; represented in mature mushroom by an annulus around the stem and sometimes a cortina on the margin of the cap [syn: partial veil]
2 membrane initially completely investing the young sporophore of various mushrooms that is ruptured by growth; represented in the mature mushroom by a volva around lower part of stem and scales on upper surface of the cap [syn: universal veil]
3 a muscular flap that closes off the nasopharynx during swallowing or speaking [syn: soft palate] [also: vela (pl)]

User Contributed Dictionary

English

Etymology

From velum ‘veil, sail’.

Pronunciation

  • /ˈviːləm/

Noun

  1. A thin membrane, resembling a veil, such as:
    1. A locomotory and feeding organ provided with cilia found in the larval stage of bivalves.
    2. A delicate membrane found on certain protists.
    3. A circular membrane round the cap of a sea jelly, or medusa.
    4. A veil-like membrane of immature mushrooms extending from the margin of the cap to the stem and is torn by growth, to reveal the gills.
    5. The soft palate.

Related terms

Latin

Alternative spellings

Noun

  1. cloth
  2. A sail of a ship
  3. An awning
  4. A curtain
  5. A veil

Inflection

Related terms

Descendants

Extensive Definition

The term, velum, derived from Latin velum, meaning a "sail", "curtain," "awning" or "veil", has several quite separate meanings in biology:
  • the locomotory and feeding organ provided with cilia found in the larval stage called the veliger or "velum-bearing" stage of bivalves, such as mussels and oysters; also a delicate membrane found on certain Protists.
  • the veil-like membrane of immature mushrooms extending from the margin of the cap to the stem and torn by growth, revealing the gills of a mature sporophore; in a mature mushroom, the remains of the velum may form an annulus or ring around the stem, familiar from common button mushrooms and sometimes on the margin of the cap.
  • a thin flap of tissue completely or partially covering the adaxial wall of the sporangium in species of Isoetes
  • Velum is also a common misspelling of vellum, calfskin (or sometimes the skins of other animals) that is similar to parchment and that is used as medium for writing, book printing, and book binding. Today, leatherette, leather, cloth or paper are more commonly used, but vellum is still used occasionally.
velum in Czech: Velum
velum in German: Velum
velum in Dutch: Velum
velum in Serbian: Велум
velum in Ukrainian: Велум
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