- calibrate
- caliche
- calibration
- calicle
- calico cat
- calicular
- calidris ferruginea
- calidris canutus
- calidris melanotos
- california bay tree
- california allspice
- california black oak
- california bluebell
- california box elder
- california condor
- california buckwheat
- california false morel
- california fern
- california laurel
- california live oak
- california nutmeg
- california pitcher plant
- california poppy
- california privet
- california redbud
- california sagebrush
- california redwood
- california white oak
- cyrilliaceae
- cyrtomium
- cyrus
- cyrus mccormick
- cyrus the elder
- cyrus the great
- cyrus the younger
- cyst
- cystic fibrosis
- cystic breast disease
- cystic mastitis
- cystitis
- cystocele
- cystolith
- cystophora
- calamity to befall
- calamus
- calamus australis
- calamus oil
- calamus rotang
- calandrinia ciliata
- calc_tufa