endosperm

noun

en·​do·​sperm ˈen-dō-ˌspərm 

plural endosperms

: a nutritive tissue in the seed of a flowering plant that is formed within the embryo sac following double fertilization

Examples of endosperm in a Sentence

Recent Examples on the Web

Whole grains have all three parts of the kernel intact, including the bran, endosperm, and germ. — Randi Gollin, Martha Stewart, 26 July 2026

Whole-Grain Pasta Whole-grain pasta, which includes whole-wheat pasta, still has the bran and germ along with the seed kernel’s endosperm. — Vanessa Caceres, Verywell Health, 15 July 2026

Full inclusion or unsifted flour retains flour’s three components, the bran, the germ, and endosperm. — Andrea Strong, Bon Appetit Magazine, 15 Apr. 2026

The evolution of endosperm was one of the innovations that gave early flowering plants an edge. — Literary Hub, 25 Mar. 2026

Word History

Etymology

French endosperme, from end- + Greek sperma seed — more at sperm

First Known Use

1819, in the meaning defined above

Phrases Containing endosperm

• endosperm nucleus

Rhymes for endosperm

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

Kids Definition

endosperm

noun

en·​do·​sperm ˈen-də-ˌspərm 

: a food-containing tissue formed within the seed in seed plants