bhūyasāṃ gavādiśṛṅgādyavayavasāmānyānāṃ gavayādijātyantareṇaikavyaktisamavāyalakṣaṇaḥ sambandhaḥ sādṛśyam
Similarity is a relation characterized by the inherence in a single individual of another species (like the gavaya) of many universal properties of parts like horns etc. found in cows and such