areca nut, betel nut
梹 centers on the areca nut, also known as the betel nut, a seed chewed as a stimulant in parts of Asia.
梹 combines 木 (tree) with 兵, which likely contributes the sound ヒン. The character refers to the areca palm and its nut.
A tree (木) that produces nuts used by soldiers (兵) as a stimulant: the areca nut tree.
For ヒン, imagine a soldier (兵) chewing a betel nut and letting out a sharp 'hin!' sound from the bitter taste: hin -> ヒン.
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