形容詞 astronomical:

1. relating or belonging to the science of astronomy
   同義詞：astronomic
2. inconceivably large
   同義詞：astronomic, galactic

1. The price of this gem is expensive -- as much so as astronomical figures.
   這個(gè)寶石的價(jià)格十分昂貴－－簡直是個(gè)天文數(shù)字。
2. His wife was astonished at the astronomical sum of money he had spent.
   他的妻子被他花的天文數(shù)字的錢款驚呆了。
3. He was too poor to buy an astronomical telescope.
   他太窮了，買不起天文望遠(yuǎn)鏡。

as.tro.nom.i.cal

adj.（形容詞）
Abbr. astron.Of or relating to astronomy.
縮寫 astron.天文學(xué)的：屬于或關(guān)于天文學(xué)的
Of enormous magnitude; immense:
巨大的：體積巨大的；龐大的：
例句：
an astronomical increase in the deficit.
赤字的巨大增長

【引伸】
as.tronom.ically
adv.（副詞）