Word Study
    
                                	step ladder |
                                	step lively |
                                	step on |
                                	step on it |
                                	step out |
                                step rocket
                                	| step stool 
                                	| step to the fore 
                                	| step up 
                                	| step- 
                                	| step-by-step 
                            
        step rocket
WORDNET DICTIONARY
Noun step rocket has 1 sense
- step rocket(n = noun.artifact) multistage rocket - a rocket having two or more rocket engines (each with its own fuel) that are fired in succession and jettisoned when the fuel is exhausted; Array has parts: booster, booster rocket, booster unit, takeoff booster, takeoff rocket
 
is a kind of projectile, rocket
            For further exploring for "step rocket" in Webster Dictionary Online
        

