There are 2 definitions of thorn in English:

thorn1

Line breaks: thorn
Pronunciation: /θɔːn
 
/

noun

1A stiff, sharp-pointed woody projection on the stem or other part of a plant.
More example sentences
  • Roses ramble over walls, branches stiff with thorns and laden with huge blossoms.
  • Certain plants have developed thorns to prevent themselves from being devoured and they work equally well as deterrents for humans too.
  • Here in south Texas, where the mesquite brush and most other native plants have thorns and where not a few critters have a mean bite, it helps to be tough.
Synonyms
1.1A source of discomfort, annoyance, or difficulty; an irritation or obstacle: the issue has become a thorn in renewing the peace talks
More example sentences
  • Why do our love lives have to be a winding road full of obstacles and thorns?
  • A friend and I were sitting around commiserating about the things that get to us: unloading small indignities, comparing thorns.
  • His visits to the shrine have been a thorn that is increasingly irritating relations between the two countries.
2 (also thorn bush or thorn tree) A thorny bush, shrub, or tree, especially a hawthorn.
More example sentences
  • ‘They threw me over the back of a camel and told me they would kill me if I cried,’ he said, sitting quietly under a thorn tree on the outskirts of Turalei.
  • Instead of a well-equipped school their children are taught beneath the shade of a thorn tree.
  • When he reached Glastonbury he planted his staff, which then took root and grew into a thorn tree.
3An Old English and Icelandic runic letter, þ or Þ, representing the dental fricatives /ð/ and /θ/. It was eventually superseded by the digraph th. Compare with eth.
[so named from the word of which it was the first letter]
More example sentences
  • Similarly, thorn may represent either a voiceless or a voiced sound: compare the current use of the digraph th in three and these.
4A yellowish-brown woodland moth which rests with the wings raised over the back, with twig-like caterpillars.
  • Ennomos and other genera, family Geometridae

Origin

Old English, of Germanic origin; related to Dutch doorn and German Dorn.

Phrases

there is no rose without a thorn

proverb Every apparently desirable situation has its share of trouble or difficulty.
More example sentences
  • There is no rose without a thorn, but people getting all hot and bothered is not going to do Sligo any good.
  • But there is no rose without a thorn and they stand for life's difficulties and tragedies.
  • Among other things, Stenwick prides itself upon the comeliness of its damsels, but, just as there is no rose without a thorn, so there is no parish whose gallery of feminine pulchritude is utterly flawless.

a thorn in someone's side (or flesh)

A source of continual annoyance or trouble: the pastor has long been a thorn in the side of the regime
More example sentences
  • We will continue to be a thorn in his side, keeping a close eye on him and interfering with his criminal activities.
  • A committed republican, he continued to be a thorn in Cromwell 's side, being elected to the protector's parliaments of 1654 and 1656, but prevented from taking his seat.
  • His uncompromising attitude continually made him a thorn in the Establishment 's side.
Synonyms
annoyance, irritant, irritation, source of irritation, source of vexation, source of annoyance, pinprick, pest, bother, trial, torment, plague, inconvenience, nuisance, menace
informal aggravation, peeve, pet peeve, pain, pain in the neck, bind, bore, headache, hassle
Scottish informal nyaff, skelf
North American informal pain in the butt, nudnik, burr in/under someone's saddle
Australian/New Zealand informal nark
British vulgar slang pain in the arse

Derivatives

thorned

adjective
More example sentences
  • She has applied for cash from the committee to buy hawthorn and other thorned bushes, which would be planted around the cemetery's borders.
  • There are more than 1,500 kinds of plants in these forests, including 19 kinds of rare plants such as the thorned cyathea spinulosa, the Chinese double-fan fern, the Chinese goose-palm catalpa and the yinque tree.
  • Huddled behind thorned bushes and high grass, the families watched as their huts - including one for grain storage - were burned.

thornless

adjective
More example sentences
  • While the species is thorny in its native habitat, many cultivars are thornless, though not all.
  • While citrus grown from seed may come true - that is, be identical to the mother tree - many gardeners plant grafted trees to ensure a good-eating fruit, quicker production and a thornless tree.
  • It often forms dense thickets, and these are often thorny, since thornless cultivars appear to retain genes for thorniness that may be expressed as genes recombine in their progeny.

thornlike

adjective
More example sentences
  • The sharp, thornlike spines along its leaves arch away from the leaf tip instead of towards it.
  • It outcompetes forage grasses, and its thornlike prickles pose a threat to workers picking vegetable crops in infested areas.
  • There are 4 rows of these on each side, from the vent rearward, with an equal number of rows of thornlike spines, the latter close set and directed rearward.

thornproof

adjective
More example sentences
  • I could've worn my jacket, it was quite thornproof, but in that heat it just wasn't worth unrolling it.
  • But in the summer heat you certainly don't want to be hauling a full-weight thornproof outfit around.
  • The tubes can be easily replaced with thornproof or solid rubber tubes which we carry in stock.

Definition of thorn in:

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Word of the day anomalous
Pronunciation: əˈnämələs
adjective
deviating from what is standard, normal, or expected

There are 2 definitions of thorn in English:

Thorn2

Line breaks: Thorn
Pronunciation: /toːɐn
 
/
German name for Toruń.

Definition of thorn in: