形容詞 circinate:

1. shaped like a ring
   同義詞：annular, annulate, annulated, circular, ringed, ring-shaped, doughnut-shaped

cir.ci.nate

adj.（形容詞）
Ring-shaped.
圈形的，環(huán)狀的
Botany Rolled up in the form of a coil with the tip in the center, as an unexpanded fern frond.
【植物學(xué)】 拳卷的，旋卷的：卷成線圈樣式，其尖端在中間的，如未展開的蕨葉的

來源：
Latin circin3tus [past participle of] circin3re [to make circular]
拉丁語 circin3tus [] circin3re的過去分詞 [使成圓形]
from circinus [pair of compasses] * see Circinus
源自 circinus [圓規(guī)] *參見 Circinus

【引伸】
cir.cinate.ly
adv.（副詞）