Term: trackball: an electronic device consisting of a rotatable ball in a housing; used to position the cursor and move images on a computer screen
Candidate hypernym: object: a tangible and visible entity; an entity that can cast a shadow → 1
Candidate hypernym: perodicticus: a genus of Lorisidae → 0
Candidate hypernym: rough-stemmed goldenrod: a variety of goldenrod → 0
Candidate hypernym: salpingectomy: surgical removal of one or both Fallopian tubes → 0
Candidate hypernym: training college: a school providing training for a special field or profession → 0
Candidate hypernym: wire recorder: an early type of magnetic recorder using iron wire → 0
Candidate hypernym: leather strip: implement consisting of a strip of leather → 0
Candidate hypernym: cobweb: filaments from a web that was spun by a spider → 0
Candidate hypernym: school: the period of instruction in a school; the time period when school is in session → 0
Candidate hypernym: liquid metal reactor: a nuclear reactor using liquid metal as a coolant → 0
Candidate hypernym: ascus: saclike structure in which ascospores are formed through sexual reproduction of ascomycetes → 0