: any of a genus (Quercus) of trees or shrubs of the beech family that produce acorns
also: any of various plants related to or resembling the oaks
b
: the tough hard durable wood of an oak tree
2
: the leaves of an oak used as decoration
Illustration of oak
1 acorn
2 leaf
Examples of oak in a Sentence
Tall oaks line the street.
The table is solid oak.
The cabinets are made of oak.
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In an adjacent room is a lounge space with emerald panels, oak bookshelves and velvet couches.—Paige Reddinger, Robb Report, 3 Apr. 2026 The tom answered his yelps a few times, and Bill sat down in a screen of bushes with his back to a broad oak and his gun ready.—Charles Elliott, Outdoor Life, 2 Apr. 2026 Two elegant lounges around the main reception hold deep velvet sofas, and the décor is all original or recreated oak panelling, intricate cornicing, 19th century fireplaces and granite flagstones.—Condé Nast, Condé Nast Traveler, 1 Apr. 2026 With this in mind, researchers led by Yu Fukasawa at Tohoku University in Sendai attached electrodes to 37 ectomycorrhizal mushrooms growing on the floor of an oak forest.—Andrew Paul, Popular Science, 1 Apr. 2026 See All Example Sentences for oak
Word History
Etymology
Middle English ook, oke, going back to Old English āc, going back to Germanic *eik- (whence also Old Frisian ēk "oak," Old Saxon ēc, Old High German eih, eihha, Old Norse eik), of obscure origin
Note:
Old English āc is a feminine root noun (dative singular and nominative plural ǣc), though forms leveled to other declensions with umlaut are already evident. Germanic *eik- has been compared with the Greek words aigílōps, a name in Theophrastus for a species of oak (Quercus macrolepis?), and krátaigos, a species of hawthorn (also in Theophrastus), but interpretation of the conjoined elements of these words is conjectural (lṓpē is not actually attested in the sense "cork" or "bark"). The derivation of Latin aesculus "a species of oak (Quercus petraea?)" is obscure. The Lithuanian dialect forms áižuols and áužuolas "oak," superficially comparable, are hypercorrections of ą́žuolas, which is very unlikely to be related to *eik- (cf. Old Prussian ansonis = German eche in the Elbing Vocabulary).
First Known Use
before the 12th century, in the meaning defined at sense 1a
Time Traveler
The first known use of oak was
before the 12th century