citrus, orange
柑 centers on citrus fruit, especially the orange. It refers to the tree and its fruit, with a focus on the sweet, edible kind.
柑 combines 木 (tree) with 甘 (sweet), reflecting a tree that produces sweet fruit. This is a straightforward semantic compound.
A tree 木 that bears sweet 甘 fruit: that's an orange tree. Picture a branch heavy with sweet citrus.
For コン, imagine a cone-shaped pile of oranges under the tree: cone -> コン, and the sweet citrus is ready to eat.
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mandarin (esp. the satsuma mandarin (Citrus unshiu)); mandarin orange; tangerine; clementine; satsuma
citrus; citrus fruit
citrus; citrus fruit
kumquat; cumquat
sanbokan sour orange (Citrus sulcata)
citron (Citrus medica)
Buddha's hand (Citrus medica sarcodactylus); fingered citron
iyokan (Citrus iyo)
Calamansi (Citrus x microcarpa)
natsumikan (Citrus natsudaidai); Japanese summer orange
chamberbitter (Phyllanthus urinaria); gripeweed; shatterstone; stonebreaker; leafflower
late-ripening citrus (e.g. pomelo)
sorrel (horse coat color)
orange; saffron
hesperidium
yukou (Citrus yuko); Japanese citrus variety
tankan orange (Citrus tankan); tankan mandarin
kawachi-bankan pomelo
emblic myrobalan (Phyllanthus emblica); emblic; myrobalan; Indian gooseberry; Malacca tree; amla; amalika
amanatsu (Citrus natsudaidai); Japanese summer orange; less sour variety of the natsumikan