annulation

n. 环 [化] 增环反应; 成环; 成环反应

发音

US /ˌænjʊˈleɪʃən/

词形变化

annulations 复数 annulations

释义与例句

n.
  1. 1.

    The formation of a ring

  2. 2.

    Any reaction that forms a ring of atoms

    化学
  3. 3.

    Any structure in the form of a ring

词源

Etymology tree Proto-Italic *ānos Latin ānus Proto-Indo-European *-lós Proto-Indo-European *-elós Proto-Italic *-elos Latin -ulus Latin ānulus Proto-Indo-European *-h₂ Proto-Indo-European *-éh₂ Proto-Indo-European *-tós Proto-Indo-European *-eh₂tos Proto-Italic *-ātos Latin -ātus Latin ānulātus Latin annulātus Proto-Indo-European *-tisder. Proto-Italic *-tjō Latin -tiō Latin -ātiōlbor. Old French -ationbor. Middle English -acioun English -ation English annulation From Latin annulātus + -ation. Compare French annulation. Piecewise doublet of annullation.

来源：wiktionary