Palus

·noun One of several upright slender calcareous processes which surround the central part of the calicle of certain corals.

palus
pālus, i, m. (neutr. collat. form pālum, i, Varr. ap. Non. 219, 18) [for paglus (cf. dim. paxillus);...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
palus
pālus (1) ī, m PAC-, a stake, prop, stay, pale : ad palum adligantur: palo suspendat aratrum, O.— ...

An Elementary Latin Dictionary