a mayfly / (by extension) ephemerality (from the way that mayflies are born and die within a day)

a mayfly / (obsolete) Synonym of 蜻蛉 (tonbo, “dragonfly”)

(archaic) the portion of a feather where the quill attaches to the skin / a feather, down, plume / a wing (as of a bird, bat, insect, or airplane) / a fletching on an arrow / a shuttlecock

Alternative spelling of 薄羽黄蜻蛉 (“globe skimmer”)

thin, weak, sparse / dilute / weak (tea)

a globe skimmer (Pantala flavescens)

【Conjunction】after; on the basis of; upon

upper, over

the first volume in a two- or three-volume set

the start / a high place; the top / one with higher rank