holdfast
/ˈhəʊldfɑːst/noun
1- a firm grip紧握。
1.1
- a staple or clamp securing an object to a wall or other surface钉子, 夹子。
1.2
- Biology a stalked organ by which an alga or other simple aquatic plant or animal is attached to a substrate【生】（海藻等的）附着器, 固着器。