(neuroanatomy, cytology) a synapse

Alternative spelling of 海老 (ebi): any long-tailed decapod crustacean or arthropod: crayfish, lobster, prawn, shrimp, etc.; a padlock; a type of 家紋 (kamon, “family crest”)

to wait or serve at a table

cornerstone, large, great, eminent; (appears to be a corruption of 礎, cornerstone)