Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
superfecundation is a noun meaning "fertilization of two or more ova released during the same menstrual cycle by sperm from separate acts of coitus (especially by different males)". It carries one recorded sense.
fertilization of two or more ova released during the same menstrual cycle by sperm from separate acts of coitus (especially by different males)
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for superfecundation come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.