Sister Block

Sister Sis"ter, n. [OE. sister, fr. Icel. systir; also suster, from AS. sweostor, sweoster, swuster, akin to OFries. sweester, suster, LG. s["u]ster, suster, D. zuster, OS. & OHG. swestar, G. schwester, Icel. systir, Sw. syster, Dan. s["o]ster, Goth. swistar, Lith. ses?, Russ. sestra, Pol. siostra, L. soror, Skr. svasr. [root]298. Cf. {Cousin}.] 1. A female who has the same parents with another person, or who has one of them only. In the latter case, she is more definitely called a half sister. The correlative of brother. [1913 Webster]

I am the sister of one Claudio. --Shak. [1913 Webster]

2. A woman who is closely allied to, or assocciated with, another person, as in the sdame faith, society, order, or community. --James ii. 15. [1913 Webster]

3. One of the same kind, or of the same condition; -- generally used adjectively; as, sister fruits. --Pope. [1913 Webster]

{Sister Block} (Naut.), a tackle block having two sheaves, one above the other.

{Sister hooks}, a pair of hooks fitted together, the shank of one forming a mousing for the other; -- called also {match hook}.

{Sister of charity}, {Sister of mercy}. (R. C. Ch.) See under {Charity}, and {Mercy}. [1913 Webster]