dragonfly
蜻 centers on the dragonfly, an insect known for its long, slender body and transparent wings. The meaning is specific to this insect.
蜻 combines 虫 (insect) with 青, which likely contributes the sound and may relate to the blue-green color often associated with dragonflies.
The insect radical 虫 beside 青 (blue-green) suggests a blue-green insect: a dragonfly, often seen shimmering in those colors.
For セイ, imagine a dragonfly landing on a saint's hand: saint -> セイ, and the saint admires the insect.
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dragonfly
Siebold's dragonfly (Anotogaster sieboldii); jumbo dragonfly
whip-carrying habenaria (Habenaria iyoensis)
Orthetrum albistylum speciosum (subspecies of white-tailed skimmer)
broad-winged damselfly (of family Calopterygidae)
Calopteryx atrata (species of damselfly)
Epiophlebia superstes (species of living-fossil dragonfly endemic to Japan)
Habenaria sagittifera (species of bog orchid)
Mortonagrion hirosei (species of damselfly)
Calopteryx cornelia (species of damselfly)
Ceriagrion nipponicum (species of damselfly)
Calopteryx atrata (species of damselfly)
dobsonfly (esp. species Protohermes grandis)
darner (any dragonfly of family Aeshnidae); devil's darning needle
owlfly (any insect of family Ascalaphidae); owl fly
dragonfly
yellow darter (Sympetrum croceolum) (dragonfly species of East Asia)