backache affecting the lumbar region or lower back; can be caused by muscle strain or arthritis or vascular insufficiency or a ruptured intervertebral disc
an organism that is the offspring of genetically dissimilar parents or stock; especially offspring produced by breeding plants or animals of different varieties or breeds or species; "a mule is a cross between a horse and a donkey"
a composite of mixed origin; "the vice-presidency is a hybrid of administrative and legislative offices"
breed animals or plants using parents of different races and varieties; "cross a horse and a donkey"; "Mendel tried crossbreeding"; "these species do not interbreed"
(meteorology) rapid inward circulation of air masses about a low-pressure center; circling counterclockwise in the northern hemisphere and clockwise in the southern
(always used with a modifier) boredom resulting from overexposure to something; "he was suffering from museum fatigue"; "after watching TV with her husband she had a bad case of football fatigue"; "the American public is experiencing scandal fatigue"; "political fatigue"
temporary loss of strength and energy resulting from hard physical or mental work; "he was hospitalized for extreme fatigue"; "growing fatigue was apparent from the decline in the execution of their athletic skills"; "weariness overcame her after twelve hours and she fell asleep"
used of materials (especially metals) in a weakened state caused by long stress; "metal fatigue"
vegetation that has grown; "a growth of trees"; "the only growth was some salt grass"
something grown or growing; "a growth of hair"
(biology) the process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level; "he proposed an indicator of osseous development in children"
a progression from simpler to more complex forms; "the growth of culture"
(pathology) an abnormal proliferation of tissue (as in a tumor)
being connected either logically or causally or by shared characteristics ; "painting and the related arts"; "school-related activities"; "related to micelle formation is the...ability of detergent actives to congregate at oil-water interfaces"