eucalyptus

American  

[yoo-kuh-lip-tuhs] / ˌyu kəˈlɪp təs /

Also eucalypt

noun

eucalypti, plural eucalyptuses plural

1. any of numerous often tall trees belonging to the genus Eucalyptus, of the myrtle family, native to Australia and adjacent islands, having aromatic evergreen leaves that are the source of medicinal oils and heavy wood used as timber.

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eucalyptus British  

/ ˌjuːkəˈlɪptəs, ˈjuːkəˌlɪpt /

noun

1. any myrtaceous tree of the mostly Australian genus Eucalyptus, such as the blue gum and ironbark, widely cultivated for the medicinal oil in their leaves ( eucalyptus oil ), timber, and ornament

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Other Word Forms

• eucalyptic
  adjective

Etymology

Origin of eucalyptus

1800–10; < New Latin < Greek eu- eu- + kalyptós covered, wrapped, akin to kalýptein to cover

Explanation

Eucalyptus is an Australian plant that produces an oil with a strong, distinctive scent. Koalas are famously fond of eating eucalyptus leaves. There are more than 600 species of eucalyptus trees and shrubs, many of which are known in their native habitat of Australia and Tasmania as "gumtrees." Most North American eucalyptus is raised for its astringent scent, or for use in cut flower arrangements. The word eucalyptus was coined by an 18th-century French botanist, from the Greek eu, "well," and kalyptos, "covered," a description of the plant's flower bud.

Example Sentences

A largely sedentary and inflexible creature, dependent on eucalyptus leaves for much of their water, koalas quickly develop dehydration when hotter conditions persist.

From Barron's • May 26, 2026

This San Diego weirdness only has tall eucalyptus as witnesses in the park.

From Salon • May 9, 2026

He would see those lorikeets again later, now feasting on the “frilly white blooms” of a eucalyptus tree, their heads dusty with pollen, dizzily enjoying their nectar-rich world.

From The Wall Street Journal • Apr. 17, 2026

Common examples include species of acacia, eucalyptus, poplar, and pine.

From Science Daily • Feb. 9, 2026

I take a deep breath of pine and eucalyptus, hear mockingbirds and seagulls and the rumbling surf in the distance.

From "I'll Give You the Sun" by Jandy Nelson