hadrosaur
[名]《古生物》カモハシ竜，ハドロサウルス
hadst
[動]((古))have の二人称・単数・直説法過去形（◆thou を主語としたときの形）
had as good [well] do (as do)
（…するなら）いっそ…したほうがましだ
had [((米))would] best do
((略式))…するのが（最も）よい，すべきだ（◆had better の強調形；否定形は had best not do，疑問形は had [hadn't]＋主語＋best do...?；((略...
had better do
…しなくてはいけない［だめだ］，…すべきだ，…したほうがいい（◆should，ought to より強く，must より弱い；否定文は had better not do）You had bet...
Hadn't we better hurry?
急いだほうがいいだろうか
