Morpheme
Cullis
Type
bound base
Denotation
filter, strain, purify
Etymology
Middle English -colyse, -colice; Old French colëice, from colëiz, from coler + -ëiz; Latin colāre
Evidence
portcullis, portcullised, portcullises, portcullising, portcullisses
Notes
<s> need not double (but can), especially with inflectional suffixes
