noun:

• water caltrop (Trapa natans); water chestnut; caltrop

noun:

• forktongue goby (Chaenogobius annularis); chestnut goby

expression:

• it often takes time to bear the fruit of one's actions; planted peach and chestnut seeds take three years (to bear fruit), persimmons take eight [literal] - proverb

noun:

• Hippocastanaceae (plant family); horse-chestnut ➜ 栃の木

noun:

• Mont Blanc (chestnut and cream dessert) - From French

noun:

• Trapa japonica (species of plant closely related to water chestnut or water caltrop)
• caltrop (weapon); caltrap

noun:

• burr (e.g. chestnut); bur; cupule; case - Botany term

noun:

• five fruits (peach, Japanese plum, apricot, jujube, Japanese chestnut)
• five types of effect in cause-and-effect relationships ［五果］ - Buddhism term
• five effects of ignorance and formations on one's current life ［五果］ - Buddhism term

noun:

• bur (of a chestnut, etc.); burr ［イガイガ・いがいが］ ➜ 毬【いが】

adverb / ~と adverb:

• irritating (e.g. one's throat); thorny; bristling ［イガイガ・いがいが］

~と adverb / adverb:

• crying of a baby - archaism - onomatopoeia

noun:

• inner, astringent skin (of a chestnut)

noun:

• Eleocharis kuroguwai (species of spikerush)
• Chinese water chestnut (Eleocharis dulcis var. tuberosa) ➜ 大黒慈姑