grandsire
/ˈgrændˌsaɪə(r)/noun
1
- archaic term for GRANDFATHER.〈古〉同GRANDFATHER.
2
- Bell-ringing a particular method of change-ringing involving an odd number of bells【鸣钟术】老祖父敲钟法（将单数数量的钟敲出不同钟声的方法）。