† motacilloidadj. and n.Obsoleterare(a) adj. resembling or related to a wagtail;(b) n. a bird resembling or related to a wagtail; a motacillid.Apparently only attested in dictionaries or glossaries.
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1895 I. K. Funk et al. Standard Dict. Eng. Lang. II. at MotacillidæMotacilloida. & n.