Ma'anar ƙamus na kalmar "allometric" shine "wanda ya shafi nazarin girman girma na wani sashe na kwayoyin halitta dangane da dukkanin kwayoyin halitta, ko kuma ga sauran sassan kwayoyin halitta daya." Ana amfani da shi sau da yawa a cikin mahallin ilmin halitta kuma yana nufin dangantaka tsakanin girma ko siffar sassa daban-daban na kwayoyin halitta yayin girma ko girma. Musamman, haɓakar allometric yana nufin haɓakar wani ɓangare na kwayoyin halitta daidai da wani sashi, wanda zai iya girma a wani nau'i daban-daban ko kuma ta wata hanya dabam.