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New American Oxford Dictionary

chemoattractant

che mo at tract ant |ˌkēmōəˈtraktənt, ˌkemō -ˌkimoʊəˈtræktənt | ▶noun Biology a substance that attracts motile cells of a particular type: a fibroblast chemoattractant.

Oxford Dictionary

chemoattractant

chemoattractant |ˌkiːməʊəˈtraktənt, ˌkɛm -| ▶noun Biology a substance which attracts motile cells of a particular type.