水中: in the water / 水柱: column of water

a seed / a pit or stone in a fruit / a gamete (reproductive cell such as a spermatozoan or egg) / a lineage, bloodline / an origin, cause / the materials or ingredients from which something is made

passive of 呼ぶ (yobu) [godan]

an animal's fang or tusk / an elephant's tusk: ivory / a tooth