名詞 holdfast:

1. restraint that attaches to something or holds something in place
   同義詞：fastener, fastening, fixing

hold.fast

n.（名詞）
Any of various devices used to fasten something securely.
緊握之物：用來(lái)緊緊扣住東西使其安全的裝置
Biology An organ or a structure of attachment, especially the basal, rootlike formation by which certain seaweeds or other algae are attached to a substrate.
【生物學(xué)】 吸盤(pán)：吸附的器官或結(jié)構(gòu)，尤指一些海藻或其他藻類(lèi)植物吸附在上面的基部的類(lèi)根結(jié)構(gòu)