discoid

/ˈdi-ˌskȯid/ (ame, mw)

discoid — 形容詞

  • discoidpositive
  • more discoidcomparative
  • most discoidsuperlative

1. having the shape of a thin, flat circle, like a coin or a small plate.

1.形容詞C2
釋義

圓盤狀的

形狀像薄而扁平的圓盤的

having the shape of a thin, flat circle, like a coin or a small plate.

例句

Ryan held up a discoid pebble he had found by the river.

Ryan 舉起一顆他在河邊撿到的圓盤狀小石頭。

attributive: discoid + noun

The ancient coin had a discoid form with worn markings on both sides.

這枚古錢幣呈圓盤狀，兩面都有磨損的紋路。

同義詞
  • disk-shaped

    the everyday equivalent; preferred in non-technical writing

  • discoidal

    a less common variant adjective, mostly in scientific texts

  • circular

    covers any flat circle but does not imply the thin, plate-like body of 'discoid'

反義詞
  • spherical

    fully three-dimensional ball shape, opposite of flat

文法句型

discoid + noun

be + discoid

用法筆記

Frequently attributive, modifying a concrete noun whose shape is being described. Largely a written or technical word — everyday English prefers 'disk-shaped' or 'round and flat'.

常見錯誤

❌The pizza was discoid and tasty.
✅The pizza was round and flat, and tasty.
💡'discoid' sounds technical; everyday food contexts prefer plain words.

2. in botany, describing a flower head that is made up only of small tubular floret

2.形容詞C2
釋義

盤狀花的

只由中央管狀小花組成、無舌狀花的

in botany, describing a flower head that is made up only of small tubular florets in the central disk, with no outer ray petals.

例句

Tansy plants in Hassan's garden produce small, yellow, discoid flower heads.

Hassan 花園裡的艾菊會開出小小的黃色盤狀花序。

attributive: discoid + flower head

Some thistles have discoid heads, missing the bright petals seen on daisies.

有些薊類植物開的是盤狀花序，沒有雛菊那種鮮豔的花瓣。

同義詞
  • rayless

    describes the same flower head from the angle of missing ray petals

反義詞
  • radiate

    having both central disk florets and outer ray petals, like a daisy

  • ligulate

    made up of strap-shaped ray florets only, with no central disk

文法句型

discoid + flower / floret / head

用法筆記

Specialist botanical term; appears almost only in textbooks, plant keys, and field guides. Contrast with 'radiate' or 'ligulate' heads that carry visible outer petals.

常見錯誤

❌a discoid rose with red petals.
✅a discoid head of small tube flowers, with no outer petals.
💡by definition, this sense rules out showy outer petals.

3. in medicine, describing a skin condition that shows small, round, flat patches o

3.形容詞C2
釋義

圓盤狀皮損的

皮膚上呈圓形扁平斑塊的

in medicine, describing a skin condition that shows small, round, flat patches on the skin.

例句

Mira was diagnosed with discoid lupus after the round patches stayed for months.

Mira 那些圓形斑塊持續數月後，被診斷為圓盤狀紅斑性狼瘡。

collocation: discoid lupus

The dermatologist showed Ritu photographs of typical discoid lesions on the cheeks.

皮膚科醫師給 Ritu 看了臉頰上典型圓盤狀皮損的照片。

collocation: discoid lesions

同義詞
  • nummular

    literally 'coin-shaped'; used of eczema with the same round-patch pattern

文法句型

discoid + lesion / rash / lupus

用法筆記

Almost always attributive in fixed medical compounds such as 'discoid lupus', 'discoid eczema', 'discoid lesion'. Outside clinical writing, learners are unlikely to meet this sense.

常見錯誤

❌My arm was discoid yesterday.
✅I had a small discoid patch on my arm yesterday.
💡'discoid' describes the patch or lesion, not the body part itself.