ˈpīlēəˌlād.ə̇d- noun
Etymology: pileolated capped, from Latin pilleolus, pileolus small cap (diminutive of pilleus, pileus felt cap) + English -ate + -ed — more at pile (hair)
: a northwestern warbler that is a variety ( Wilsonia pusilla pileolata ) of Wilson's warbler distinguished by a brighter olive green on the upper parts and a deeper yellow beneath