Sister

n. 1 woman or girl in relation to her siblings. 2 female fellow member of a trade union, feminist group, etc. 3 senior female nurse. 4 member of a female religious order. 5 (often attrib.) of the same type, design, or origin etc. (sister ship; prose, the younger sister of verse). J. sisterly adj. [Old English] sisterhood n. 1 relationship between or as between sisters. 2 society of esp. religious or charitable women. 3 community of feeling between women. sisterinlaw n. (pl. sistersinlaw) 1 sister of one’s wife or husband. 2 wife of one’s brother.