零余子蕁麻

むかごいらくさ ムカゴイラクサ

Laportea bulbifera (species of nettle-like plant)

零余子虎の尾

むかごとらのお

alpine bistort (Bistorta vivipara)

零因子

ぜろいんし れいいんし

zero divisor

余因子

よいんし

cofactor

零

れい ぜろ ゼロ

zero, nought

零戦

ぜろせん ゼロせん れいせん

Zero fighter plane

零点

れいてん

zero, no marks

飄零

blowing in the wind (e.g. leaf, petal)

零本

れいほん

fragmentary remains of a large set of writings, the odd volume, a few pages

零細

れいさい

insignificant, trifling, paltry, cottage (industry), tiny (company)

零時

れいじ

twelve o'clock, midnight, noon

零度

れいど

zero, absolute zero (temp.), freezing point

零れ

こぼれ

spilling, spill

零す

こぼす

to spill, to drop, to shed (tears)

零露

れいろ れいつゆ

dripping dew

零敗

れいはい

going undefeated, losing without scoring a point, whitewash, being shut out

巾零

きんれい

nilpotent

冪零

べきれい

nilpotent

零元

れいげん

zero element