← BackshareGuesssetaceous/sɪˈteɪʃəs/adjectiveHaving or resembling bristles or stiff hairs.Botanists describe the plant's stem as setaceous because of its bristly texture.The setaceous leaves of the cactus are actually modified spines.The caterpillar's setaceous body felt rough to the touch.SynonymsspinybristlyhairyAntonymssmooth