clud/clus

close; shut

Spelled clud, clus · claudere 'close, shut'; compound forms -cludere and -clusus

Latin claudere shuts a door: include shuts in, exclude shuts out, and a recluse lives shut away.

Words built from it

conclude — Bring to an end or reach a judgment.
con- (together) + claudere (shut), through Latin concludere (shut up, finish)
include — Contain or count as part of a whole.
in- (in) + claudere (shut), through Latin includere (shut in)
exclude — Keep someone or something out.
ex- (out) + claudere (shut), through Latin excludere (shut out)
seclude — Keep apart from other people or activity.
se- (apart) + claudere (shut), through Latin secludere (shut apart)
recluse — A person who lives apart from others.
re- (back) + claudere (shut), through Latin recludere and Late Latin reclusus (shut away)
occlude — Block or close an opening.
ob- (against), becoming oc- + claudere (shut), through Latin occludere
preclude — Prevent something or make it impossible.
prae- (before) + claudere (shut), through Latin praecludere (shut off)

cluster — From Old English clyster, meaning a bunch. Its clus letters do not come from Latin claudere.