noun

1. a thin strip of hard rubber, plastic, metal, etc. with teeth, passed through the hair to arrange or clean it, or set in the hair to hold it in place or as an ornament
2. anything like a comb in form, function, or location; specif.,
   1. a currycomb
   2. a fine-toothed implement or machine used to clean and straighten long fibers of wool, cotton, flax, etc.
   3. a red, fleshy outgrowth on the top of the head, as of a rooster
   4. a thing like a rooster's comb in position or appearance, as the crest of a helmet
3. a honeycomb

Etymology: ME < OE camb, comb, lit., toothed object < IE *ombhos (> Sans jámbah, Gr gomphos, tooth) < base *ĝembh-,ĝombh-, to bite, tooth

transitive verb

1. to clean, straighten out, or arrange with a comb
2. to remove with or as with a comb; separate: often with out
3. ☆ to search thoroughly; look everywhere in to comb a house for a missing book

intransitive verb

noun

1. combination
2. combining