(n)reddish-brown dried gummy exudation from any of several trees of the genus Eucalyptus especially Eucalyptus camaldulensis, Syn.red gum, eucalyptus kino

eucalyptus oil

(n)an essential oil obtained from the leaves of eucalypts

genus eucalyptus

(n)tall trees native to the Australian region; source of timber and medicinal oils from the aromatic leaves

alpine ash

(n)tall timber tree with hard heavy pinkish or light brown wood, Syn.Eucalyptus delegatensis, mountain oak

blue gum

(n)tall fast-growing timber tree with leaves containing a medicinal oil; young leaves are bluish, Syn.Eucalyptus globulus, fever tree

cider gum

(n)small to medium-sized tree of Tasmania, Syn.Eucalypt gunnii

forest red gum

(n)tall tree of Queensland and New South Wales and Victoria, Syn.Eucalypt tereticornis

lemon-scented gum

(n)similar to but smaller than the spotted gum and having lemon-scented leaves, Syn.Eucalyptus citriodora, Eucalyptus maculata citriodora

manna gum

(n)tall tree yielding a false manna, Syn.Eucalyptus viminalis

mountain ash

(n)tree having wood similar to the alpine ash; tallest tree in Australia and tallest hardwood in the world, Syn.Eucalyptus regnans

mountain swamp gum

(n)medium-sized swamp gum of New South Wales and Victoria, Syn.Eucalyptus camphora

red gum

(n)very large red gum tree, Syn.Eucalyptus calophylla, marri

red gum

(n)red gum tree of Tasmania, Syn.peppermint, peppermint gum, Eucalyptus amygdalina

river red gum

(n)somewhat crooked red gum tree growing chiefly along rivers; has durable reddish lumber used in heavy construction, Syn.Eucalyptus rostrata, river gum, Eucalyptus camaldulensis

rose gum

(n)very tall tree of Queensland and New South Wales, Syn.Eucalypt grandis

snow gum

(n)small to medium-sized tree of Australia and Tasmania having smooth white to light-grey bark shedding in patches or strips, Syn.white ash, ghost gum, Eucalyptus pauciflora, Eucalyptus coriacea

spotted gum

(n)large gum tree with mottled bark, Syn.Eucalyptus maculata

swamp gum

(n)medium-sized tree of southern Australia, Syn.Eucalypt ovata

white mallee

(n)small shrubby mallee, Syn.congoo mallee, Eucalyptus dumosa

white mountain ash

(n)large tree with dark compact bark on lower trunk but smooth and white above; yields lumber similar to that of European or American ashes, Syn.Eucalyptus fraxinoides

white stringybark

(n)stringybark having white wood, Syn.Eucalyptusd eugenioides, thin-leaved stringybark

The Collaborative International Dictionary of English (GCIDE) v.0.53Collaborative International Dictionary (GCIDE)

eucalypt

n. a tree of the genus Eucalyptus.
Syn. -- eucalyptus, eucalyptus tree, gum tree. [ WordNet 1.5 ]

eucalyptol

n. [ eucalyptus + L. oleum oil. ] (Chem.) A volatile, terpenelike oil (C10H18O), which is the main constituent of the oil of eucalyptus. It has cockroach repellent activity and is used as a flavoring aid in pharmaceuticals. Chemically it is 1, 3, 3-trimethyl-2-oxabicyclo-[ 2, 2, 2 ]-octane. MI11
Syn. -- cineole, cajeputol. [ 1913 Webster +PJC ]

In the 1913 Webster eucalytpol was defined as an oil “consisting largely of cymene”. Cymene (isopropyltoluene, C10H14) differs from that of the substance currently called eucalyptol, in having an unsaturated ring and no oxygen. Para-cymene does occur in eucalyptus oil as well as some other essential oils. [ PJC ]

Eucalyptus

‖n. [ NL., from Gr. e'y^ well, good + &unr_; covered. The buds of Eucalyptus have a hemispherical or conical covering, which falls off at anthesis. ] (Bot.) A myrtaceous genus of trees, mostly Australian. Many of them grow to an immense height, one or two species exceeding the height even of the California Sequoia.
Syn. -- eucalyptus tree, gum tree, eucalypt. [ 1913 Webster ]

☞ They have rigid, entire leaves with one edge turned toward the zenith. Most of them secrete resinous gums, whence they called gum trees, and their timber is of great value. Eucalyptus Globulus is the blue gum; E. gigantea, the stringy bark: E. amygdalina, the peppermint tree. E. Gunnii, the Tasmanian cider tree, yields a refreshing drink from wounds made in the bark in the spring. Other species yield oils, tars, acids, dyes and tans. It is said that miasmatic valleys in Algeria and Portugal, and a part of the unhealthy Roman Campagna, have been made more salubrious by planting groves of these trees. [ 1913 Webster ]

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