angiosperm

noun

an·​gio·​sperm ˈan-jē-ə-ˌspərm 

plural angiosperms

: any of a class (Angiospermae) of vascular plants that have male and female reproductive structures enclosed in a flower, that have seeds which arise from ovules contained in the ovaries, and that produce dry or fleshy fruits after double fertilization : flowering plant

Angiosperms … have their ovules consistently enclosed in a carpel, which prevents direct access of pollen to the ovules.

—P. Barry Tomlinson

Perhaps such habitats even antedate the appearance of angiosperm plants, which first flourished on a large scale in the Cretaceous period …

—Michael Goulding

compare gymnosperm

angiospermous

ˌan-jē-ə-ˈspər-məs 

adjective

angiospermous plant species

angiospermy

ˈan-jē-ə-ˌspər-mē 

noun

Angiospermy is a key innovation in angiosperms. It does not occur in other plant groups. The ovules are completely enclosed in a carpel.

—Peter K. Endress and Anton Igersheim

Examples of angiosperm in a Sentence

Recent Examples on the Web

From the fossils, the research team identified conifer foliage, seed fern, and angiosperm leaves — flowering plants. —Monica Cull, Discover Magazine, 9 June 2025

The complementary relationships between angiosperms and animals generated, Eiseley argues, a world more intricate and interconnected, and the concentrated foodstuffs sped mammalian evolution. —Rebecca Solnit october 19, Literary Hub, 19 Oct. 2021

The surviving angiosperms got a boost from changes to the soil. —Riley Black, Smithsonian Magazine, 29 July 2024

During this research, the team found out that angiosperms, which are generally hardwood trees like oaks and cherry, have macrofibrils measuring about 17 nanometers in diameter on average. —Michael Franco, New Atlas, 31 July 2024

The evolution and spread of legumes, too, increased nitrogen levels in soils and favored the spread of angiosperms. —Riley Black, Smithsonian Magazine, 29 July 2024

Today, nearly 80 percent of all terrestrial plants are angiosperms. —Jack Tamisiea, New York Times, 12 Sep. 2023

This finding highlights how resilient angiosperms have been over hundreds of millions of years. —Jamie Thompson, Discover Magazine, 15 Sep. 2023

Flowering plants are known to scientists as angiosperms. —Jack Tamisiea, New York Times, 12 Sep. 2023

Word History

Etymology

borrowed from French angiosperme "angiospermous plant," noun derivative of angiosperme "angiospermous," borrowed from New Latin angiospermus "having seeds contained in a capsule, having a pericarp," from Greek angeîon "vessel, container" + -o- -o- + -spermos "having a seed (of the kind specified)," derivative of spérma "seed" — more at angio-, sperm

First Known Use

circa 1828, in the meaning defined above

Rhymes for angiosperm

• disaffirm
• ectoderm
• endoderm
• endosperm
• interfirm
• isotherm
• mesoderm
• periderm
• reaffirm
• affirm
• bookworm
• confirm

Kids Definition

angiosperm

noun

an·​gio·​sperm ˈan-jē-ə-ˌspərm 

: flowering plant

angiospermous

ˌan-jē-ə-ˈspər-məs 

adjective

Medical Definition

angiosperm

noun

an·​gio·​sperm ˈan-jē-ə-ˌspərm 

: any of a class (Angiospermae) of plants (as oaks or roses) that have reproductive structures contained in flowers and seeds enclosed in ovaries compare gymnosperm

angiospermous

ˌan-jē-ə-ˈspər-məs 

adjective