The Collaborative International Dictionary
nematocide
nematocide \nem"a*to*cide\ (n[e^]m"[.a]*t[-o]*s[imac]d or n[i^]*m[a^]t"[-o]*s[imac]d), n. A substance that kills nematodes, especially one used in medicine or to kill plant pathogens. [Also spelled nematicide.]
Wiktionary
nematocide
n. (alternative form of nematicide English)