sesquiennial

释义与例句

adj.
  1. 1.

    Occurring once every one and a half years (i.e. once every 18 months, or twice every three years); sesquiannual.

    The endemic Australian sea lion is one of the world's rarest and most unusual seals: rare in terms of very small numbers and unusual in its having a sesquiennial reproductive cycle. [Australian sea lions' breeding cycle is a 17-18 month aseasonal one.]

词源

From Latin sesquiennium (compare sesqui- and biennial).

来源：wiktionary