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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
test-cross is a noun meaning "a cross between an organism whose genotype for a certain trait is unknown and an organism that is homozygous recessive for that trait so the unknown genotype can be determined from that of the offspring". It carries one recorded sense.
a cross between an organism whose genotype for a certain trait is unknown and an organism that is homozygous recessive for that trait so the unknown genotype can be determined from that of the offspring
Definitions, synonyms and semantic relations for test-cross come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.