OBSabbr.观察(=Observation)abbr.瞭望台(=Observatory)abbr.已废的(=Obsolete)abbr.无线电定向标选择器(=Omnibearing Selector)
obstruentn.[罕][解](体内通道的)堵塞物(例如肾石);止泻剂adj.[罕]闭塞的;阻碍的