hollo

, noun pl. -·los′

1. (a shout or call) used as to attract a person's attention or to urge on hounds in hunting
2. (a shout) used to express greeting or surprise

Etymology: var. of holla, hallo

intransitive verb, transitive verb -·loed, -·lo·ing

1. to shout (at) in order to attract attention
2. to urge on (hounds) by calling out “hollo”
3. to shout or call, as in greeting