Definition that contains acorn
- oak a deciduous tree of the genus Quercus; has acorns and lobed leaves
- mast nuts of forest trees (as beechnuts and acorns) accumulated on the ground
- ctenophora comb jellies; sea acorns; a small phylum formerly considered a class of Coelenterata
- cupule cup-shaped structure of hardened bracts at the base of an acorn
- white oak any of numerous Old World and American oaks having 6 to 8 stamens in each floret, acorns that mature in one year and leaf veins that never extend beyond the margin of the leaf
- quercus vaccinifolia a low spreading or prostrate shrub of southwestern United States with small acorns and leaves resembling those of the huckleberry
- quercus lobata tall graceful deciduous California oak having leathery leaves and slender pointed acorns
- mossy-cup oak medium to large deciduous oak of central and eastern North America with ovoid acorns deeply immersed in large fringed cups; yields tough close-grained wood
- chicken little a fictional character who was hit on the head with an acorn and believed that the sky was falling
- acorn cup cup-shaped structure of hardened bracts at the base of an acorn